Glucometer Setup, How to Use, Error Codes & Troubleshooting Guide

First-Time Glucometer Setup & How to Check Blood Sugar Correctly

Blood glucose meters, commonly called glucometers, allow people to measure their blood glucose level using a small drop of capillary blood. Modern glucometers are compact, portable and relatively simple to operate, but correct setup and testing technique are important for obtaining reliable results.

If you have purchased a new glucometer and are wondering how to set it up, insert the test strip, use the lancing device, apply blood or understand the reading, this guide will take you through the process step by step.

This article is part of the Microsidd Knowledge Hub Glucometer Help Centre, covering first-time setup, blood glucose testing, test-strip handling, common glucometer problems, error messages, maintenance and model-specific troubleshooting.

Important: Glucometers and test strips differ between manufacturers and models. This guide explains common procedures applicable to many blood glucose monitoring systems. Always follow the Instructions for Use (IFU) supplied with your specific meter and test strips when they differ from this general guide.

1. What Is a Glucometer?

A glucometer or blood glucose meter (BGM) is a portable medical device designed to measure the concentration of glucose in a small blood sample.

Most personal blood glucose monitoring systems consist of three main components:

A glucometer
Compatible glucose test strips
A lancing device and sterile lancets

A small blood sample is usually obtained from a fingertip using the lancing device. The blood is applied to or drawn into a compatible test strip inserted into the glucometer.

The meter analyzes the sample and displays a glucose reading, usually within several seconds.

Depending on the meter and its market configuration, results may be displayed in:

mg/dL (milligrams per decilitre), commonly used in India and several other countries; or
mmol/L (millimoles per litre).

Do not attempt to change measurement units unless the manufacturer's instructions specifically permit it.

2. What Is a Glucometer Used For?

A glucometer is primarily used for self-monitoring of blood glucose (SMBG).

Blood glucose monitoring may help a person and their healthcare professional understand how glucose levels vary in relation to factors such as:

Meals
Physical activity
Medication
Insulin
Illness
Stress
Changes in daily routine

The appropriate testing frequency and timing vary from person to person.

A healthcare professional should advise you about when and how often you should test, particularly if blood glucose results are being used to make treatment decisions.

A glucometer provides a glucose measurement at a particular moment. It does not replace laboratory testing, medical diagnosis or professional clinical advice.

3. What's Inside a Typical Glucometer Kit?

The exact contents depend on the brand and model.

A typical glucometer kit may contain:

Component	Purpose
Blood Glucose Meter	Measures and displays glucose result
Test Strips	Receive the blood sample for measurement
Lancing Device	Holds the lancet and creates a small finger prick
Sterile Lancets	Single-use needles used with the lancing device
Battery	Powers the glucometer
Carrying Case	Stores the meter and accessories
User Manual / IFU	Provides model-specific operating instructions
Control Solution	May be supplied separately or with certain systems

Some meters are sold as meter-only packs, while others include a small quantity of test strips and lancets.

Always check the package contents before first use.

4. The Most Important Rule: Use Only Compatible Test Strips

One of the most important things for every glucometer user to understand is:

Glucometer test strips are generally model-specific.

Owning a blood glucose meter does not mean that any glucose strip can be inserted into it.

For example, a strip designed for one meter family may be physically or electronically incompatible with another.

Using an incorrect strip may result in:

The meter not switching on
A strip recognition error
An error message
Failure to perform the test
Potentially unreliable results if an incompatible product is somehow accepted

Before purchasing replacement strips, check the exact meter name and model.

Practical Tip

If you are unsure which strips your glucometer requires, look at:

The meter itself
Original meter packaging
User manual
Existing strip container or foil
Manufacturer's compatibility information

Do not select strips only because the brand name looks similar.

5. Check Your Test Strips Before Testing

Before opening or using a glucose test strip, verify:

Expiry Date

Do not use strips beyond the manufacturer's expiry date.

Packaging

Do not use a strip if its individual foil or container appears damaged, where applicable.

Storage

Strips should be stored according to their manufacturer's specified temperature and humidity requirements.

Strip Container

If your strips are supplied in a vial, close the cap promptly after removing a strip.

Prolonged exposure to moisture or unsuitable environmental conditions can damage certain test strips.

Correct Strip

Confirm that the strip is specifically intended for your glucometer model.

6. First-Time Glucometer Setup

When opening a new glucometer, avoid immediately performing a blood test without checking the basic setup.

A few minutes spent preparing the meter can prevent unnecessary confusion later.

Step 1: Inspect the Meter

Remove the meter from its packaging and check for obvious physical damage.

Inspect:

Display
Buttons
Test-strip port
Battery compartment

Read the quick-start guide or user manual supplied with the device.

7. Installing the Battery

Many glucometers use coin-cell batteries such as CR2032 batteries, while other models use different battery types.

Your specific meter's manual should state the correct battery.

General Procedure

Locate the battery compartment.
Open the battery cover.
Insert the specified battery in the correct polarity.
Close the compartment securely.
Switch on the meter or insert a test strip, depending on the model.

If the meter does not switch on after installing a new battery, check:

Battery orientation
Correct battery type
Protective battery tab, if present
Battery contacts
Whether the battery is discharged

Never force an incorrectly sized battery into the compartment.

8. Setting the Date and Time

Many glucometers store previous results in memory.

Correct date and time settings therefore help you identify when each glucose measurement was taken.

Depending on the meter, you may be able to configure:

Year
Month
Day
Hour
Minute
12-hour or 24-hour clock

Some advanced meters may synchronize date and time through a connected application.

Because the button sequence varies considerably between models, follow the user manual for your particular meter.

Why Does the Correct Date and Time Matter?

Imagine measuring glucose before breakfast and again after dinner.

If the meter's clock is incorrect, reviewing stored readings later becomes more difficult.

Correct timestamps can make glucose records more meaningful when discussing results with a healthcare professional.

9. Does My Glucometer Need Coding?

Older glucose monitoring systems sometimes required the user to manually enter a code or insert a coding chip corresponding to the test-strip batch.

Many newer meters are no-code or automatically coded, but this should never be assumed.

Check your meter's instructions.

If your system requires coding, the meter and strips must be prepared exactly as specified by the manufacturer before testing.

Incorrect coding on a system that requires it may affect test performance.

10. Prepare the Lancing Device

The lancing device is used to obtain a small capillary blood sample.

Although designs vary, the general procedure is often similar.

Typical Setup

Remove the lancing device cap.
Insert a new sterile lancet.
Twist or remove the protective lancet cover as instructed.
Replace the lancing device cap.
Select an appropriate penetration depth.
Prime or cock the device if required.

11. Choosing the Lancet Depth

Many lancing devices have adjustable penetration settings.

A lower setting produces a shallower puncture, while a higher setting generally penetrates deeper.

The ideal setting depends on factors such as:

Skin thickness
Calluses
Individual comfort
Amount of blood required by the test strip

Start with an appropriate lower or middle setting according to the device instructions and adjust only if necessary.

The objective is to obtain enough blood for the test without unnecessarily deep puncturing.

12. Never Share Lancets or Lancing Devices

Lancets are generally intended for single-person use and sterile lancets are normally single-use.

Never share a lancet between individuals.

Lancing devices intended for personal use should also not be shared because blood contamination can create an infection-transmission risk.

Dispose of used lancets safely according to local sharps-disposal recommendations.

13. Wash and Dry Your Hands Before Testing

Hand preparation is one of the simplest but most important parts of blood glucose testing.

Before testing:

Wash your hands with soap and water.
Rinse thoroughly.
Dry completely.

Food residue, sugar-containing substances, moisture or other contaminants on the fingers may interfere with testing.

Why Dry Hands Matter

Water remaining on the finger may dilute the blood sample.

Make sure the test finger is clean and completely dry before obtaining the sample.

14. Insert the Test Strip

Remove one compatible test strip from its packaging.

If the strips are supplied in a vial, close the vial immediately after removing the strip.

Insert the strip into the meter in the orientation shown by the manufacturer.

Many meters automatically switch on when a test strip is inserted.

The screen may display:

A strip symbol
Blood-drop symbol
Sample-ready indication
Other model-specific prompt

Do not apply blood until the meter indicates that it is ready for the sample.

15. How to Obtain the Blood Sample

Once the meter and strip are ready:

Prepare the loaded lancing device.
Select a fingertip.
Place the lancing device firmly against the finger.
Activate the device.
Allow a blood drop to form.

Using the side of the fingertip rather than the central pad may be more comfortable for some people.

Avoid excessive squeezing or "milking" of the finger unless specifically instructed, as excessive pressure can affect sample quality.

16. How Much Blood Does a Glucometer Need?

There is no universal blood-volume requirement for all glucometers.

Modern meters often require only a very small sample, but the exact volume varies by model.

This is one reason we should not publish a single blood-volume specification for every meter.

Always follow the sample requirement stated for your meter and strips.

Insufficient blood may result in:

Error message
Incomplete test
Failed test
Potentially unreliable result, depending on the system

17. Applying Blood to the Test Strip

This is another area where users commonly make mistakes.

Many modern strips use capillary action.

Instead of placing blood anywhere on the strip, the blood drop is brought into contact with the designated sample inlet or application area.

The strip draws the required blood into its reaction chamber.

General Technique

Allow an adequate blood drop to form.
Bring the specified edge or sample area of the strip to the blood drop.
Keep it in contact until the meter confirms sufficient sample has been received.
Move your finger away.
Wait for the result.

Do not smear blood over the strip unless the manufacturer's instructions specifically require that technique.

18. Wait for the Result

After sufficient blood has been applied, the glucometer begins measuring the sample.

Many modern meters display a countdown.

After several seconds, the blood glucose result appears on screen.

The exact testing time depends on the model.

Do not remove the test strip prematurely unless the meter's instructions tell you to do so.

19. Understanding Your Glucose Reading

In India, many glucometers display results in:

mg/dL

For example:

108 mg/dL

This is the glucose concentration measured by the meter at that particular time.

However, a single number should not automatically be interpreted as "good", "bad", "normal" or "dangerous" without considering factors such as:

Whether you were fasting
Time since your last meal
Diabetes diagnosis/status
Medication
Pregnancy
Illness
Your individualized glucose targets

Your healthcare professional should advise you regarding your personal target range.

20. What Does HI Mean on a Glucometer?

Some meters display HI when the measured glucose concentration is above the meter's reportable measurement range.

The exact upper limit varies between meters.

Do not assume that HI means the same numerical glucose concentration on every glucometer.

If a HI result appears:

Wash and dry your hands.
Repeat the test with a new compatible strip according to the manufacturer's instructions.
Check that strips are correctly stored and within expiry.
Follow the meter's instructions for HI readings.

A repeatedly very high or HI reading, particularly when accompanied by symptoms or illness, warrants prompt medical attention.

21. What Does LO Mean on a Glucometer?

Similarly, LO may indicate that the glucose concentration is below the meter's reportable measurement range.

The exact lower limit depends on the meter.

A very low glucose result can require urgent attention.

Follow the manufacturer's instructions and your healthcare professional's hypoglycemia management advice.

If symptoms are severe, results are repeatedly very low, or the person cannot safely self-manage, seek urgent medical assistance.

22. Why Can Two Glucometer Readings Be Different?

Users sometimes perform two tests immediately and become concerned because the numbers are not identical.

Small differences can occur due to factors including:

Natural meter/test-strip analytical variation
Different blood drops
Sample volume
Hand contamination
Environmental conditions
Strip storage
Testing technique
Differences between meter technologies

Home glucose meters are monitoring devices and should not be expected to produce perfectly identical readings every time.

If results repeatedly appear inconsistent with how you feel or differ substantially from expectations, check the testing technique and consult the meter manufacturer or a healthcare professional as appropriate.

23. Never Compare Two Different Meters Expecting Identical Numbers

Testing the same finger with two different glucometers does not necessarily produce exactly the same reading.

For example:

Meter A: 118 mg/dL
Meter B: 125 mg/dL

A numerical difference alone does not prove that one meter is defective.

Different approved blood glucose monitoring systems can show some variation while operating within their applicable performance requirements.

If accuracy is in doubt, follow the manufacturer's control-testing procedure or discuss comparison with an appropriate laboratory measurement with your healthcare professional.

24. Remove and Dispose of the Used Strip

After the result is displayed:

Record the reading if required.
Remove the used strip according to the meter instructions.
Dispose of the strip appropriately.
Remove the used lancet carefully.
Place the lancet in an appropriate sharps-disposal container.

Do not reuse test strips.

Do not reuse single-use lancets.

25. Your First Blood Glucose Test – Quick Checklist

Before every test:

Confirm you have the correct test strips.
Check strip expiry and packaging.
Wash your hands.
Dry your hands completely.
Load a new sterile lancet.
Insert the test strip correctly.
Wait for the meter's sample-ready indication.
Obtain an adequate blood drop.
Apply blood to the correct sample area.
Wait for the meter to display the result.
Record the reading if required.
Dispose of the strip and lancet safely.

26. Common First-Time Glucometer Mistakes

New users commonly experience problems because of technique rather than meter failure.

Mistake 1: Buying the Wrong Test Strips

Always match the strip to the exact glucometer model.

Mistake 2: Applying Blood Before the Meter Is Ready

Wait for the sample-ready indication.

Mistake 3: Applying Blood to the Wrong Part of the Strip

Locate the sample inlet specified in the instructions.

Mistake 4: Using Too Little Blood

Ensure the strip receives the required sample.

Mistake 5: Testing With Wet Hands

Dry hands completely after washing.

Mistake 6: Leaving the Strip Vial Open

Close strip containers promptly.

Mistake 7: Using Expired Strips

Always check expiry dates.

Mistake 8: Reusing Test Strips

Blood glucose test strips are single-use.

Mistake 9: Reusing or Sharing Lancets

Use sterile lancets appropriately and never share blood-contact equipment.

Mistake 10: Assuming Every Error Means the Meter Is Defective

Many error messages are caused by strip insertion, sample application, temperature, battery or other correctable issues.

We'll cover these in detail in Part 2.

27. General Testing Workflow

For many glucometers, the basic workflow can be remembered as:

WASH → DRY → STRIP → LANCET → BLOOD → SAMPLE → WAIT → RESULT

WASH

Wash your hands.

DRY

Dry them completely.

STRIP

Insert the correct test strip.

LANCET

Prepare a fresh lancet and obtain the blood drop.

BLOOD

Ensure an adequate sample forms.

SAMPLE

Allow the designated strip area to draw in the blood.

WAIT

Allow the meter to complete the test.

RESULT

Read and record the glucose result.

This sequence applies broadly to many modern glucose monitoring systems, but always follow your particular meter's IFU.

28. Glucometers Covered by the Microsidd Knowledge Hub

The complete Microsidd Glucometer Help Centre will provide guidance for several commonly used blood glucose monitoring systems, including:

On Call

On Call Plus
On Call Extra

Accu-Chek

Accu-Chek Active
Accu-Chek Instant

Dr. Morepen

BG03

SD Biosensor

SD CodeFree

Gluneo

Gluneo Blood Glucose Meter

Sinocare

Safe-Accu
Safe AQ Smart
Safe AQ Max1
Safe AQ Max3

i-SENS

CareSens N

Because test-strip compatibility, blood volume, testing time, measurement range and error messages can vary between models, model-specific information will be clearly separated from general glucometer instructions.

29. Choosing Replacement Glucometer Strips

When your original strips are finished, identify the meter model before ordering replacements.

Microsidd supplies compatible glucose test strips for several popular glucose monitoring systems.

When shopping for strips, verify:

Brand → Meter Model → Strip Name → Pack Size → Expiry/Storage Information

Never select strips based only on price or appearance.

Explore Glucometers & Compatible Test Strips

Visit the Microsidd Diabetes Care collection to find glucometers, compatible glucose test strips, lancets and other diabetes-monitoring supplies.

Microsidd.com

30. Why Proper Technique Matters

A high-quality glucometer can only perform as intended when the entire testing process is carried out correctly.

Reliable blood glucose monitoring depends on the combination of:

Correct Meter

Correct Compatible Strip

Properly Stored Strip

Clean, Dry Hands

Adequate Blood Sample

Correct Testing Technique

Understanding these fundamentals can prevent many of the problems users incorrectly assume are glucometer malfunctions.

Part 1 Summary

For first-time glucometer users, remember these essential points:

Use only test strips compatible with your exact meter.
Read the manufacturer's Instructions for Use before first use.
Install the correct battery and configure date/time where applicable.
Determine whether your meter requires coding.
Wash and completely dry your hands before testing.
Use a new sterile lancet appropriately.
Insert the strip before applying blood unless your specific instructions state otherwise.
Apply blood only to the designated sample area.
Ensure sufficient blood is collected.
Never reuse glucose test strips.
Do not share lancets or personal-use lancing devices.
Do not assume HI, LO or error codes have identical meanings across every meter.
Discuss personal glucose targets and treatment decisions with your healthcare professional.

Part 2

Glucometer Troubleshooting, Wrong Readings, Test Strip Problems, Battery Issues & Maintenance

Glucometer Setup, How to Use, Error Codes & Troubleshooting Guide

Part 2: Glucometer Troubleshooting, Wrong Readings, Test Strip Problems, Battery Issues & Maintenance

A glucometer that suddenly displays an error, refuses to recognize a test strip, gives an unexpected result or does not switch on can be frustrating—especially when you need to check your blood glucose immediately.

However, an error message does not automatically mean that the glucometer is defective.

Many common glucometer problems are related to:

Incorrect test-strip insertion
Incompatible test strips
Insufficient blood sample
Applying blood at the wrong time
Expired or improperly stored strips
Low battery
Temperature conditions
Contaminated or wet hands
Incorrect testing technique
Damaged strips
Meter-specific operating requirements

This section of the Microsidd Knowledge Hub Glucometer Help Centre explains how to systematically troubleshoot common blood glucose meter problems.

Important: Error codes such as E-1, E-2, E-3, E-4 or other symbols do not necessarily mean the same thing on every glucometer. Always consult the Instructions for Use (IFU) supplied with your specific meter. Model-specific error codes will be covered separately in Part 3.

1. Glucometer Not Switching On

One of the most common complaints is:

"My glucometer is not turning on."

Before assuming that the meter has failed, perform a few basic checks.

Possible Causes

Battery Is Discharged

The battery may simply need replacement.

Battery Is Installed Incorrectly

Coin-cell batteries have positive and negative sides. Incorrect orientation may prevent the meter from powering on.

Wrong Battery Type

Different meters use different batteries. Use only the type specified by the manufacturer.

Protective Battery Tab Is Still Installed

Some new meters are supplied with a protective tab to prevent battery drain during storage.

Test Strip Is Not Fully Inserted

Many meters automatically switch on when a test strip is inserted. If the strip is not inserted completely or in the correct direction, the meter may remain off.

Battery Contacts Are Dirty or Damaged

Poor contact can prevent power from reaching the meter.

What Should You Do?

Remove the test strip.
Check the battery.
Confirm the correct battery orientation.
Replace the battery if necessary.
Insert a new compatible strip correctly.
Try switching on the meter again.

If the glucometer still does not operate after following the manufacturer's troubleshooting procedure, contact the manufacturer or authorized service/support provider.

2. Glucometer Does Not Recognize the Test Strip

Another frequent problem is:

"I inserted the strip, but nothing happened."

Possible Causes

Wrong strip type
Strip inserted backwards
Strip not inserted fully
Damaged strip
Previously used strip
Contaminated strip contacts
Meter battery problem
Damaged strip port
Strip or meter outside recommended operating conditions

Troubleshooting

First verify that the test strip is specifically compatible with your meter.

Then:

Remove the strip.
Inspect it for visible damage.
Use a new strip.
Insert it in the direction shown in the meter instructions.
Push it only as far as specified—never force it.
Wait for the meter's sample-ready indication.

If multiple new compatible strips are not recognized, the issue may require manufacturer support.

3. Never Force a Test Strip Into the Meter

If a strip does not fit easily, stop.

A common mistake is trying to force an incompatible strip into the test-strip port.

Different glucose meters may use strips that look similar but have different:

Dimensions
Electrical contacts
Enzyme chemistry
Calibration
Sample application areas
Meter communication systems

Forcing the wrong strip may damage the meter's strip port.

4. Blood Applied but the Test Does Not Start

You insert the strip, obtain a blood drop and apply it—but the meter does not begin counting down.

This usually indicates that the meter did not receive the sample correctly.

Possible Causes

Insufficient blood
Blood applied to the wrong area
Blood applied before the meter was ready
Blood smeared across the strip
Strip removed during sample application
Damaged strip
Partially filled sample channel

What Should You Do?

Do not repeatedly add blood to the same strip unless the manufacturer specifically allows additional sample application.

For many systems, the safest approach after a failed test is:

Remove the used/failed strip.
Dispose of it.
Wash and dry your hands if necessary.
Insert a new strip.
Wait for the blood-drop/sample-ready symbol.
Obtain an adequate blood drop.
Apply it correctly.

Always follow your meter's IFU because sample reapplication rules differ between systems.

5. Insufficient Blood Sample

Modern glucometers often require very small blood volumes, but the exact requirement varies.

If the sample is too small, the reaction chamber may not fill adequately.

The meter may:

Display an error
Fail to start
Stop the test
Request another test
Produce another model-specific indication

Never assume that all meters require the same sample volume.

6. How to Get a Better Blood Drop

If you frequently struggle to obtain enough blood:

Warm Your Hands

Cold fingers can have reduced peripheral blood flow.

Wash your hands with comfortably warm water and dry them thoroughly.

Lower Your Hand

Allowing the hand to hang below heart level briefly may encourage blood flow toward the fingers.

Massage Gently Toward the Fingertip

Gentle movement from the base of the finger toward the fingertip may help.

Adjust the Lancing Depth

If your lancing device has adjustable depth, a slightly deeper setting may be necessary for thicker skin.

Try Another Finger

Repeated testing can make frequently used sites more difficult or uncomfortable.

Avoid aggressively squeezing the fingertip.

7. Why Does My Glucometer Show an Error After Applying Blood?

An error immediately after sample application can have several causes.

Common possibilities include:

Too little blood
Blood applied incorrectly
Damaged strip
Expired strip
Incorrectly stored strip
Temperature outside operating range
Strip inserted incorrectly
Timing error during sample application

The exact meaning depends on the error displayed by your particular meter.

This is why searching simply for "glucometer E-3 error" without specifying the meter model can lead to incorrect advice.

8. Understanding Glucometer Error Codes

Manufacturers use their own error-code systems.

For example, an error labelled:

E-1

on one meter may indicate something completely different from E-1 on another meter.

The same applies to:

E-2
E-3
E-4
E-5
Er1
Er2
Error symbols
Thermometer symbols
Battery symbols
Strip icons

Golden Rule

Always identify the glucometer model before interpreting an error code.

In Part 3 of this guide, Microsidd will provide separate troubleshooting sections for supported models rather than combining unrelated manufacturer error codes.

9. Glucometer Showing an Unexpectedly High Reading

Suppose your glucose reading is much higher than expected.

Before assuming that your glucose level has suddenly changed, consider whether a testing problem may have occurred—but do not dismiss a potentially genuine high reading.

Check Your Hands

Sugar-containing food residue on your fingertips may interfere with some glucose measurements.

Wash with soap and water and dry thoroughly before retesting.

Check the Strip

Confirm:

Correct strip
Valid expiry
Proper storage
Undamaged packaging

Repeat the Test

If appropriate under the manufacturer's instructions, repeat using:

Clean, dry hands
New strip
New blood sample

If the result remains unexpectedly high, follow your healthcare professional's advice.

10. Glucometer Showing an Unexpectedly Low Reading

Unexpectedly low readings should also be taken seriously.

Possible testing-related factors can include:

Inadequate sample
Strip problem
Environmental conditions
Incorrect testing procedure

However, a low reading may represent genuine hypoglycemia.

If the result is low and particularly if symptoms are present, follow the hypoglycemia management plan provided by your healthcare professional.

Do not delay appropriate treatment merely because you suspect the meter may be wrong.

11. What Does HI Mean?

Many glucometers display HI when the glucose concentration exceeds the meter's measurable/reportable range.

HI does not mean:

"Your blood glucose is slightly high."

It may indicate that the glucose concentration is above the upper measurement limit of that particular meter.

Because measurement ranges vary between glucometers, the numerical threshold for HI must be checked in the model-specific manual.

12. What Should You Do If the Meter Shows HI?

Follow the manufacturer's instructions.

A reasonable general troubleshooting sequence may include:

Wash and completely dry your hands.
Check the test-strip expiry and condition.
Repeat the test using a new compatible strip according to the IFU.
If HI persists, follow your healthcare professional's instructions and seek appropriate medical advice promptly.

Repeated HI readings should not be dismissed as a meter problem without proper assessment.

13. What Does LO Mean?

LO commonly indicates that the glucose concentration is below the meter's lower reportable range.

Again, the exact threshold is model-specific.

Very low blood glucose can be medically significant.

Follow the manufacturer's instructions and the hypoglycemia treatment plan provided by your healthcare professional.

If the person has severe symptoms, altered consciousness, seizures, cannot swallow safely, or otherwise requires urgent care, seek emergency medical assistance.

14. Why Do I Get Different Readings From the Same Glucometer?

A common question is:

"I tested twice within two minutes. Why did I get two different numbers?"

Blood glucose meter readings are not expected to be perfectly identical every time.

Differences may result from:

Normal analytical variation
Different blood drops
Different fingers
Sample size
Hand contamination
Strip variation
Temperature
Testing technique

For example, two readings that are numerically different do not automatically establish meter failure.

If the differences are repeatedly large or results do not match your symptoms, investigate further.

15. Why Does My Glucometer Differ From a Laboratory Result?

Home glucometers and laboratory analyzers are different measurement systems.

Differences can arise because of:

Sample type
Timing of collection
Meter calibration
Analytical method
Physiological changes between samples
Sample handling

Blood glucose can change over relatively short periods, particularly after meals, medication, insulin or physical activity.

Therefore, comparing a laboratory result collected at one time with a home glucometer reading taken significantly later is not a direct comparison.

If meter accuracy is a concern, ask your healthcare professional about an appropriate comparison procedure.

16. Why Do Two Different Glucometers Give Different Results?

Different meter systems may use:

Different strip chemistry
Different enzymes
Different algorithms
Different calibration approaches
Different sample requirements

Therefore:

Meter A: 142 mg/dL

and

Meter B: 151 mg/dL

does not automatically mean one meter is faulty.

Do not repeatedly test using multiple meters simply to search for a preferred number.

For routine monitoring, consistency in using a properly functioning meter and correct technique is generally more useful.

17. Test Strip Expiry Problems

Expired strips should not be used.

Test strips contain chemical and biological components designed to function under specified conditions for a defined shelf life.

After expiry, performance cannot be assumed.

Always check the expiry date before testing.

18. What Happens if Glucometer Strips Are Stored Incorrectly?

Test strips can be sensitive to environmental conditions.

Potential problems include exposure to:

Excessive heat
Excessive cold
Humidity
Moisture
Direct sunlight
Improperly closed containers

Always follow the storage temperature and conditions printed on the strip packaging or IFU.

19. Never Transfer Strips Between Containers

If your strips are supplied in a vial, keep them in their original manufacturer-supplied container unless the manufacturer specifically instructs otherwise.

Do not transfer strips into:

Plastic bags
Medicine containers
Other strip vials
Loose storage boxes

Original containers may be designed to protect strips from environmental exposure.

20. Individually Foiled vs Vial-Packed Test Strips

Some glucose strips are individually sealed in foil, while others are packed together in a vial.

Individually Foiled Strips

Each strip remains sealed until use.

This can be convenient where testing is less frequent or where individual strip protection is desirable.

Vial-Packed Strips

Multiple strips are stored together in a container.

The vial should be closed promptly after removing each strip.

Neither format should automatically be considered universally superior; suitability depends on the specific product, storage conditions and user needs.

21. Glucometer Temperature Error

Glucometers and strips are designed to operate within specified environmental temperature ranges.

If the meter or strips become too hot or too cold, the device may:

Display an error
Refuse to perform the test
Display a temperature symbol

Do not attempt to artificially heat or cool the meter rapidly.

Move the meter and strips to an environment within the manufacturer's specified operating range and allow them to equilibrate as instructed before testing.

22. Can I Keep My Glucometer in a Car?

This is generally not a good storage practice.

A parked vehicle can become extremely hot, especially in Indian weather conditions.

High temperatures may exceed the permitted storage conditions for:

Meter
Test strips
Control solution

Store the system according to the manufacturer's instructions.

23. Low Battery Warning

A glucometer may display:

Battery icon
Low battery message
Flashing battery symbol
Model-specific error

Replace the battery with the type specified in the user manual.

Do not wait until the meter becomes completely unusable if a persistent low-battery warning appears.

24. Will Changing the Battery Delete My Readings?

This depends on the glucometer.

Many modern meters retain stored readings after battery replacement, but settings such as date or time may require confirmation or resetting on some models.

Check the user manual before removing the battery if stored data is important.

25. Display Is Faint or Difficult to Read

A faint display may be associated with:

Low battery
Temperature
Display damage
Meter malfunction

First check the battery and operating conditions.

If portions of the LCD are permanently missing, numbers cannot be read clearly, or the display appears damaged, stop relying on uncertain readings and contact the manufacturer or service provider.

26. Cleaning Your Glucometer

Blood glucose meters should be kept clean according to the manufacturer's cleaning instructions.

Do not automatically:

Immerse the meter in water
Wash it under running water
Spray liquid directly into the strip port
Use strong chemicals
Allow fluid to enter openings

Use only the cleaning and, where applicable, disinfection method approved for your specific device.

27. Cleaning the Lancing Device

Blood may occasionally contaminate the lancing device.

Follow the manufacturer's cleaning instructions.

Never share a personal-use lancing device with another person.

If a meter or lancing device is used in a professional multi-patient environment, specific infection-control requirements apply, and only equipment approved for such use should be used according to applicable protocols.

28. What Is Glucometer Control Solution?

Control solution is a liquid containing a known glucose concentration range designed to check whether a compatible meter and test-strip system is functioning appropriately.

It is not blood and is not used to measure a person's glucose.

A control test checks the meter-strip testing system under specified conditions.

29. When Might a Control Solution Test Be Useful?

Depending on the manufacturer's instructions, control testing may be recommended:

When opening a new strip container
If results appear unusual
After dropping the meter
When meter performance is questioned
When learning to use the system
When strips may have been stored improperly
As otherwise specified by the manufacturer

Not every meter uses the same control solution.

Use only control solution approved for the particular glucose monitoring system.

30. Understanding Control Solution Results

Control solution packaging or test-strip labeling normally specifies an acceptable control range.

The control result should fall within the applicable printed range when the procedure is performed correctly.

The control range is not a recommended human blood glucose range.

Do not confuse the two.

If control results repeatedly fall outside the specified range, do not simply continue testing without investigating the cause according to the manufacturer instructions.

31. Meter Dropped on the Floor – Can I Still Use It?

If your glucometer is dropped:

Inspect it for cracks or physical damage.
Check the display.
Check the strip port.
Follow any manufacturer-recommended functional/control test.
Confirm that the meter operates normally.

If the casing, screen or strip port is visibly damaged, contact the manufacturer or replace the meter as appropriate.

32. Water Entered the Glucometer

A glucometer is an electronic medical device.

If significant liquid enters the device:

Do not continue testing blindly.
Follow the manufacturer's instructions.
Do not attempt unsafe disassembly or home repair.
Contact authorized support if necessary.

33. Can I Repair a Glucometer Myself?

Users should generally not open or modify the internal electronics of a glucometer.

Attempting repairs may:

Damage the device
Affect measurement performance
Void warranty
Create unreliable results

Battery replacement and routine cleaning should be performed only as described in the user instructions.

Internal repairs should be handled by authorized personnel where applicable.

34. When Should a Glucometer Be Replaced?

There is no universal replacement interval applicable to every glucometer.

Replacement may be appropriate if:

Meter is physically damaged
Display is unreadable
Strip port is damaged
Meter repeatedly fails control checks despite correct procedure
Compatible strips are no longer available
Manufacturer recommends replacement
Device has persistent unexplained malfunctions
Meter no longer meets the user's monitoring needs

Age alone does not necessarily determine whether a meter must be replaced.

35. Test Strip Stuck Inside the Meter

Do not insert sharp objects into the test-strip port.

Try removing the strip gently according to the manufacturer's instructions.

If part of the strip has broken inside the device, contact the manufacturer or service provider.

Attempting to remove debris using pins, needles or metal objects could damage the internal contacts.

36. Meter Shows Error With Every Strip

If several new strips produce the same problem, check systematically:

Step 1

Confirm the strips are the correct model.

Step 2

Check expiry.

Step 3

Check storage conditions.

Step 4

Check strip insertion.

Step 5

Check battery.

Step 6

Check operating temperature.

Step 7

Try a new strip from the properly stored supply.

Step 8

Perform a control test if recommended and available.

If the problem continues, contact manufacturer support.

37. A Simple Glucometer Troubleshooting Flow

Meter Doesn't Work

START

↓

Does the meter switch on?

→ Check battery
→ Check battery orientation
→ Replace battery
→ Recheck

YES

↓

Does the meter recognize the strip?

→ Check strip compatibility
→ Check insertion direction
→ Try a new strip

YES

↓

Does the meter show sample-ready?

→ Check manual/error message

YES

↓

Did the test start after blood application?

→ Check sample size
→ Check application area
→ Use a new strip if required

YES

↓

Is the result unexpected?

YES

→ Wash and dry hands
→ Check strips
→ Repeat according to IFU
→ Consider control test
→ Seek healthcare advice when appropriate

38. Ten Things to Check Before Blaming the Glucometer

Before concluding that a meter is faulty, check:

Correct strips?
Strips within expiry?
Strips stored properly?
Battery working?
Hands washed?
Hands completely dry?
Enough blood?
Blood applied correctly?
Meter within operating temperature?
Manufacturer's troubleshooting instructions followed?

Many apparently defective-meter problems can be traced to one of these factors.

39. What NOT to Do When Troubleshooting

Do not:

Insert incompatible strips
Reuse a failed strip
Keep adding blood unless specifically permitted
Open the meter electronics
Wash the meter under running water
Insert pins into the strip port
Use expired strips
Use another brand's control solution without verified compatibility
Assume internet explanations of an error code apply to your model
Ignore severe symptoms because you think the meter is wrong

40. Error Code vs Error Cause – Important Difference

An error code is the manufacturer's specific diagnostic message.

An error cause is the underlying problem.

For example, possible causes across different meters may involve:

Strip error
Sample error
Temperature error
Battery problem
Internal meter problem

But the code assigned to those problems varies by manufacturer.

Therefore, Microsidd's model-specific guide will use this format:

Meter Model

Displayed Error → Manufacturer-defined meaning → Recommended action

This is substantially safer and more useful than publishing one universal E1/E2/E3 table.

41. Troubleshooting Unexpected Results

If a glucose result does not match how you feel:

First

Do not immediately alter treatment based solely on an obviously questionable result without following your established healthcare plan.

Then Check

Hands
Strips
Expiry
Storage
Sample
Testing procedure
Meter condition

Retest

Repeat according to the meter instructions using a new strip where appropriate.

Seek Advice

If the unexpected result persists or symptoms are concerning, contact your healthcare professional.

42. Symptoms Matter Too

A glucometer is an important monitoring tool, but the person using it matters more than the number displayed.

If someone experiences concerning symptoms despite an apparently normal meter reading—or significant symptoms of very high or low glucose—seek appropriate medical assessment.

Do not use a home glucose meter as the sole basis for dismissing significant symptoms.

43. Long-Term Glucometer Storage

If you will not use your meter for an extended period:

Clean it as recommended.
Store it in its carrying case.
Keep it dry.
Protect it from extreme temperatures.
Follow battery-storage recommendations.
Store strips separately according to their instructions.
Check strip expiry before resuming testing.

Do not store used lancets inside the carrying case.

44. Travelling With a Glucometer

When travelling, consider carrying:

Glucometer
Sufficient compatible strips
Lancing device
Sterile lancets
Spare battery
Appropriate sharps-disposal solution
Medication/insulin as prescribed
User manual or access to model instructions

Protect test strips and the meter from unsuitable temperatures during travel.

45. Frequently Asked Troubleshooting Questions

Why is my glucometer showing an error?

Possible causes include strip, sample, temperature, battery or meter problems. Check the exact error in your model's manual.

Why isn't my test strip absorbing blood?

The sample may be too small, applied to the wrong area, or the strip may be damaged. Follow the strip's sample-application instructions.

Can I add more blood to the same strip?

Only if the manufacturer specifically states that additional sample can be applied. Otherwise use a new strip.

Why won't my glucometer turn on after inserting a strip?

Check strip compatibility, insertion direction, battery condition and meter instructions.

Can expired glucose strips give wrong readings?

Expired strips should not be used because their performance after expiry cannot be assumed.

Why does my glucometer keep showing HI?

HI commonly indicates a result above the meter's reportable range. Repeat according to the IFU and seek medical advice promptly if HI persists.

Why does my meter keep showing LO?

LO commonly indicates a result below the meter's reportable range. Follow your hypoglycemia plan and seek urgent assistance when appropriate.

Should I replace my meter if two readings differ?

Not necessarily. Some variation between repeated glucose measurements is expected.

Can I clean my glucometer with sanitizer?

Only use cleaning agents and methods approved by the meter manufacturer.

Can I use another company's control solution?

Do not assume compatibility. Use the control solution specified for your system.

46. Microsidd Glucometer Troubleshooting Principle

When troubleshooting any blood glucose meter, remember:

Identify → Inspect → Correct → Retest → Escalate

IDENTIFY

Identify the exact meter and strip.

INSPECT

Check battery, strip, expiry, storage, sample and environment.

CORRECT

Correct the suspected problem.

RETEST

Use a new compatible strip according to the IFU where appropriate.

ESCALATE

If the problem persists—or the glucose result or symptoms require medical attention—contact the appropriate manufacturer, healthcare professional or emergency service.

Part 2 Summary

Most glucometer problems can be investigated systematically.

Remember:

An error does not automatically mean the meter is defective.
Verify test-strip compatibility first.
Never reuse failed test strips.
Do not assume all error codes mean the same thing.
Keep strips properly stored and within expiry.
Wash and completely dry your hands before testing.
Insufficient blood is a common source of failed tests.
Check the battery when the meter fails to start or the display becomes weak.
Keep the meter and strips within manufacturer-specified temperature conditions.
Use only compatible control solution.
Do not attempt internal repairs.
Repeated HI or LO readings require appropriate attention.
Unexpected results should be investigated rather than ignored.
Significant symptoms require appropriate medical evaluation regardless of what the meter displays.

Part 3

Model-Specific Glucometer Setup, Error Codes & Troubleshooting

The first two parts of this guide covered the procedures that are common to most blood glucose monitoring systems: first-time setup, battery installation, hand preparation, blood sampling, test-strip handling, unexpected readings, HI/LO displays, strip errors, storage and general troubleshooting.

This final section focuses on the individual glucometer models commonly sold by Microsidd.

This separation is important because although glucometers work on broadly similar principles, the following can vary significantly between models:

Compatible test strip
Test time
Required blood volume
Coding requirements
Battery type
Memory functions
Date and time setup
Sample application method
Operating temperature
Error messages
Error-code meanings

Important: Never assume that an E-1, E-2, E-3 or similar error means the same thing on every glucometer. Manufacturer-specific instructions always take priority over general troubleshooting advice.

Model Directory

This guide covers:

On Call Plus
On Call Extra
Accu-Chek Active
Accu-Chek Instant
Dr. Morepen BG03
SD CodeFree
Gluneo
CareSens N
Sinocare Safe-Accu
Sinocare Safe AQ Smart
Sinocare Safe AQ Max1
Sinocare Safe AQ Max3

1. On Call Plus Glucometer

The On Call Plus Blood Glucose Monitoring System is designed for routine blood glucose self-monitoring and is widely used because of its simple operation and availability of compatible replacement strips.

Compatible Test Strip

Use:

On Call Plus Blood Glucose Test Strips

Do not substitute On Call Extra strips or another On Call family strip unless the manufacturer specifically confirms compatibility.

Buy On Call Plus Glucometer

https://microsidd.com/products/oncall-plus-glucometer-with-10-free-strips

Buy On Call Plus Test Strips

Search Microsidd.com for On Call Plus Glucometer Strips or visit the Diabetes Care collection.

Basic Testing Workflow

Wash and completely dry your hands.
Insert a compatible On Call Plus strip.
Wait for the meter's sample-ready indication.
Obtain a blood sample using the lancing device.
Apply blood to the specified sample area.
Allow the meter to complete the test.
Record the reading if required.

If the Meter Does Not Recognize the Strip

Check:

Correct On Call Plus strip
Strip direction
Strip fully inserted
Strip condition
Expiry
Battery condition

If several new strips are not recognized, consult the On Call Plus instructions or ACON support documentation.

ACON maintains an official document library for On Call blood glucose systems, reinforcing the importance of using product-specific manuals rather than generic online error-code lists.

2. On Call Extra Glucometer

The On Call Extra is a separate blood glucose monitoring system from On Call Plus.

Compatible Test Strip

Use only:

On Call Extra Blood Glucose Test Strips

On Call Plus and On Call Extra strips should not be assumed to be interchangeable.

Buy On Call Extra Glucometer

https://microsidd.com/products/oncall-extra-glucometer

Individually Foiled Strips

Some On Call Extra strip configurations are individually foil packed.

Where supplied this way:

Open one foil only when ready to test.
Do not use strips from damaged foil.
Check expiry before use.
Do not transfer strips into another container.

Individual foil protection can be useful for users who test less frequently or want each strip separately protected until use.

Common Troubleshooting

If a test fails:

Use a fresh compatible strip.
Confirm the foil is intact.
Wait for the meter to request blood.
Ensure adequate sample volume.
Follow the specific On Call Extra manual for any displayed code.

3. Accu-Chek Active Glucometer

The Accu-Chek Active is one of the most widely recognized blood glucose meters in India.

Buy Accu-Chek Active Glucometer

https://microsidd.com/products/accucheck-active-glucometer-kit

Compatible Test Strip

Use:

Accu-Chek Active Blood Glucose Test Strips

Do not assume Accu-Chek Instant or other Accu-Chek family strips are compatible.

Important Accu-Chek Principle

Roche provides product-specific manuals and error-code resources for its meter families. This is important because even within Accu-Chek, error-code systems differ between devices.

For this reason, if your Active meter displays an error:

Confirm the exact model.
Consult the Active manual.
Do not use an error-code explanation written for Accu-Chek Guide, Instant or another Roche meter.

General Active Troubleshooting

If the result seems unusual:

Wash and dry hands.
Use a fresh compatible Active strip.
Check strip expiry.
Repeat according to the IFU.
Consider control testing where recommended.

4. Accu-Chek Instant Glucometer

Accu-Chek Instant is a separate system designed for convenient routine glucose monitoring.

Compatible Strip

Use:

Accu-Chek Instant Test Strips

Do not use Accu-Chek Active strips.

If the Display Is Blank

Across Accu-Chek meter support materials, blank-display causes may include exhausted batteries, extreme operating temperatures, display damage or meter malfunction. The exact troubleshooting procedure should still be followed from the Instant-specific documentation.

5. Dr. Morepen BG03 Glucometer

The Dr. Morepen BG03 is widely used for home glucose monitoring in India.

Compatible Strip

Use:

Dr. Morepen BG03 Test Strips

Because Dr. Morepen offers different diabetes products, always verify the meter model before buying strips.

Common BG03 Troubleshooting Checklist

If BG03 does not start:

Check battery.
Check strip orientation.
Confirm the strip is BG03-compatible.
Use a fresh strip.

If blood is applied but testing does not begin:

Confirm that the meter displayed its sample-ready indication.
Ensure sufficient blood.
Apply the sample to the correct strip area.
Repeat with a new strip where necessary.

If a numerical error code appears, interpret it from the BG03-specific IFU rather than using an error table written for another glucometer.

6. SD CodeFree Glucometer

The SD CodeFree Blood Glucose Meter is designed for code-free blood glucose monitoring.

Buy SD CodeFree Glucometer

https://microsidd.com/products/sd-codefree-blood-glucose-meter

Buy SD CodeFree Test Strips

https://microsidd.com/products/sd-codefree-100-glucometer-strips

Compatible Strip

Use:

SD CodeFree Blood Glucose Test Strips

"CodeFree" Does Not Mean "Any Strip"

The name refers to the system not requiring traditional manual strip coding.

It does not mean the meter accepts universal glucose strips.

Only strips specified for the SD CodeFree system should be used.

Troubleshooting

For repeated strip errors:

Confirm SD CodeFree strips.
Check expiry.
Verify storage conditions.
Insert the strip correctly.
Use a new strip.
Check the battery.
Follow the SD CodeFree-specific manual for any code shown.

7. Gluneo Glucometer

The Gluneo Blood Glucose Meter is another home glucose monitoring option available through Microsidd.

Buy Gluneo Glucometer

https://microsidd.com/products/gluneo-glucometer-meter-only

Buy Gluneo Strips

https://microsidd.com/products/gluneo-lite-glucometer-strips-100

Compatible Strip

Use the specific Gluneo / Gluneo Lite strips stated as compatible with your meter configuration.

Because product names within meter families can be similar, verify compatibility from the package and IFU before ordering.

Common Troubleshooting

If the meter fails to read a strip:

Confirm the strip family.
Inspect strip contacts.
Check expiry.
Insert the strip in the correct direction.
Do not force it.
Repeat with a new strip.

8. CareSens N Glucometer

CareSens N is manufactured by i-SENS.

This is one model where official manufacturer documentation provides useful model-specific error guidance.

Compatible Strip

Use:

CareSens N Blood Glucose Test Strips

Verified CareSens N Error Examples

According to i-SENS documentation, CareSens N-family documentation includes meter-specific error messages such as:

Error 5 – Strip Insertion / Wrong Strip

The manufacturer's documentation states that this may occur when the wrong glucose test strip is used instead of a CareSens N strip.

Recommended Action

Repeat using a CareSens N test strip.

Error 6 – Meter Failure

This indicates a meter problem.

The manufacturer's instruction is to stop using the meter and contact the authorized i-SENS representative.

Error 8 – Electronic/Meter Error

An electronic error occurred during the test.

The manufacturer's guidance is to repeat using a new strip and, if the problem persists, contact the authorized representative.

Temperature Messages

CareSens documentation also includes specific messages for testing below or above its operating temperature range and instructs users to move the system into its permitted environment before repeating the test.

This is a good example of why model-specific manuals matter.

9. Sinocare Safe-Accu Glucometer

The Sinocare Safe-Accu belongs to Sinocare's blood glucose monitoring portfolio.

Buy Safe-Accu Glucometer

https://microsidd.com/products/sinocare-safe-accu-glucometer

Compatible Strip

Use:

Sinocare Safe-Accu Test Strips

Never assume strips from Safe AQ Smart or Safe AQ Max are compatible merely because all meters are manufactured by Sinocare.

General Safe-Accu Troubleshooting

If the meter does not recognize a strip:

Confirm the exact Safe-Accu strip.
Check insertion.
Check expiry.
Check packaging.
Replace the strip.
Check battery.

Follow the Safe-Accu manual for any numerical error displayed.

10. Sinocare Safe AQ Smart Glucometer

Buy Safe AQ Smart

https://microsidd.com/products/sinocare-safe-aq-smart-glucometer

Strip Compatibility

Only use strips specifically approved for the Safe AQ Smart system.

Do not automatically use Safe AQ Max strips.

Troubleshooting

If repeated tests fail:

Check compatibility first.
Use a new strip.
Ensure adequate sample.
Verify temperature.
Check battery.
Consult the Safe AQ Smart IFU.

11. Sinocare Safe AQ Max1 Glucometer

Buy Safe AQ Max1

https://microsidd.com/products/sinocare-safe-aq-max-1-glucometer

Sinocare documentation specifically identifies Safe AQ Max-series meters and matching strip systems as model-specific combinations.

For example, official documentation states that Safe AQ Max I meters are intended for use with Safe AQ Max I test strips, and the corresponding Max I strips are intended for that meter system. It also identifies these strips as no-coding products.

Important Rule

Safe AQ Max1 Meter → Safe AQ Max1 Strips

Do not assume that Max1 and Max3 strips are interchangeable.

12. Sinocare Safe AQ Max3 Glucometer

Buy Safe AQ Max3

https://microsidd.com/products/sinocare-safe-aq-max-3-glucometer

Compatible Strip

Use the Safe AQ Max3-specific glucose strips intended for the meter.

Microsidd also offers configurations of Max3 strips that are individually foil packed.

Individually Foiled Strip Advantages

Each strip remains sealed until required.

This may help provide:

Individual protection from environmental exposure
Convenient storage
Easy distribution of single tests
Less frequent exposure of unused strips to air or humidity

Always check the foil integrity before use.

Sinocare Battery Example – Why Model Manuals Matter

Official Sinocare documentation for one of its meter families specifies a 3 V CR2032 lithium battery, recommends checking the date/time and other settings after battery replacement, and notes that stored results remain in memory despite battery removal for that documented system.

This illustrates an important point:

Battery behavior, preserved settings and reset behavior should always be confirmed from the documentation for the exact Sinocare model being used.

Do not assume every Sinocare meter behaves identically.

Model Compatibility Quick Reference

Glucometer	Compatible Strip Family
On Call Plus	On Call Plus Strips
On Call Extra	On Call Extra Strips
Accu-Chek Active	Accu-Chek Active Strips
Accu-Chek Instant	Accu-Chek Instant Strips
Dr. Morepen BG03	BG03 Strips
SD CodeFree	SD CodeFree Strips
Gluneo	Compatible Gluneo strip family
CareSens N	CareSens N Strips
Sinocare Safe-Accu	Safe-Accu Strips
Sinocare Safe AQ Smart	Safe AQ Smart-compatible strips
Safe AQ Max1	Safe AQ Max1 Strips
Safe AQ Max3	Safe AQ Max3 Strips

The exact compatible product should always be confirmed from the meter/strip IFU before use.

Why Error Codes Cannot Be Combined Into One Universal Table

This is one of the most important lessons in this entire guide.

Imagine two different meters displaying:

E-3

The user may search:

"What does E3 mean on a glucometer?"

But without knowing the meter model, the answer may be wrong.

For example, Accu-Chek documentation for certain Guide-family meters states that E-3 can indicate a meter or test-strip error and, in rare circumstances, may also appear with glucose above the system measuring range.

CareSens, Sinocare, ACON and other manufacturers use their own error systems.

Therefore:

Never interpret an error code without first identifying the exact glucometer.

How to Search for the Correct Error

When a meter displays an error, search using:

Brand + Exact Meter + Error

For example:

Accu-Chek Active E5

rather than:

Glucometer E5

or:

CareSens N Error 6

rather than:

Blood sugar machine error 6

This greatly improves the chance of obtaining the correct manufacturer-specific information.

Universal Error Troubleshooting Checklist

Regardless of model, if you encounter an error, check these factors first:

Exact glucometer model
Correct compatible strip
Strip expiry
Strip storage
Strip insertion
Blood sample volume
Sample application timing
Battery
Operating temperature
Physical meter damage

After checking these, consult the model-specific IFU.

When to Contact Manufacturer Support

Contact the manufacturer or authorized support provider when:

Error persists after repeating with a new strip.
Multiple strips are rejected.
Meter repeatedly fails control tests.
Display is damaged.
Strip port is damaged.
Electronic/meter-failure error is displayed.
Meter has suffered significant impact or liquid exposure.
The manufacturer's IFU specifically instructs you to stop using the device.

When to Contact a Healthcare Professional Instead

Not every "glucometer problem" is a technical problem.

Seek appropriate medical advice when:

Glucose repeatedly reads very high.
Glucose repeatedly reads very low.
HI or LO persists after correctly repeating the test.
Results do not match significant symptoms.
You have symptoms of severe hypoglycemia or hyperglycemia.
You are uncertain how to act on a glucose result.

30 Frequently Asked Questions

1. Can any glucose strip work with any glucometer?

No. Most glucose strips are model-specific.

2. Can On Call Plus strips work in On Call Extra?

Do not assume compatibility. They are separate monitoring systems and should use their specified strips.

3. Can Accu-Chek Active strips be used with Accu-Chek Instant?

No. These are different meter systems with different strip families.

4. Does CodeFree mean universal strips?

No. SD CodeFree still requires its specified test strips.

5. Can Safe AQ Max1 strips be used in Max3?

Do not assume they are interchangeable. Use the specific strip approved for the meter.

6. Why does my meter reject a new strip?

Possible reasons include incorrect strip, insertion direction, damaged strip, battery issue or meter error.

7. Why does my meter show E1?

The meaning depends on the meter model.

8. Why does my meter show E2?

Again, interpret the code only from the exact model's IFU.

9. Why does my meter show E3?

There is no universal E3 meaning.

10. Can I search an error code online?

Yes, but always include the brand and exact meter model.

11. Should I reuse the strip after an error?

Generally no. Use a new strip unless the manufacturer explicitly instructs otherwise.

12. Can I add more blood after an insufficient sample?

Only if your specific system permits sample reapplication.

13. Why does my meter show HI?

HI commonly indicates glucose above the meter's reportable range. Check the exact model manual and respond appropriately.

14. Why does it show LO?

LO commonly indicates glucose below the meter's reportable range.

15. Should I ignore HI if I feel normal?

No. Repeat correctly according to the IFU and seek appropriate medical advice if it persists.

16. Can cold temperature cause errors?

Yes. Many glucometers operate only within specified temperature ranges.

17. Can heat damage test strips?

Exposure beyond the manufacturer's storage conditions can affect strip performance.

18. Can I store strips in the refrigerator?

Only if the manufacturer explicitly recommends the relevant storage range. Do not refrigerate strips automatically.

19. Why does my meter differ from another meter?

Different systems can produce somewhat different readings because of analytical and sample variation.

20. Can I use strips after expiry?

No.

21. Can different people share a glucometer?

Personal-use equipment requires strict infection-control precautions. Never share lancets or personal-use lancing devices.

22. How often should I replace the battery?

Replace it when the meter indicates low battery or as required.

23. Do stored readings disappear after battery replacement?

This depends on the meter. Check the model instructions.

24. Should I perform control testing?

Follow the manufacturer's recommendation, particularly when results seem unusual or meter/strip performance is questioned.

25. Can I use any control solution?

No. Use only compatible control solution specified for the system.

26. My meter fell. Do I need a new one?

Inspect it and follow the manufacturer-recommended functionality/control checks.

27. My screen is damaged. Can I keep using it?

Do not rely on a meter if readings cannot be confidently interpreted.

28. Which glucose meter has the cheapest strips?

Strip cost varies substantially between systems. Microsidd's glucometer comparison guides can help compare long-term strip costs before choosing a meter.

29. Where can I buy compatible replacement strips?

Microsidd supplies compatible strips for several popular glucose monitoring systems through its Diabetes Care and Glucometer Strips collections.

30. What should I do if I still cannot solve the problem?

Stop guessing. Identify the exact model, consult its IFU and contact the manufacturer, seller or appropriate healthcare professional depending on whether the problem is technical or medical.

Buy Compatible Glucometers & Test Strips from Microsidd

One of the most frequent reasons for meter errors is using the wrong replacement test strip.

Microsidd supplies glucose monitoring products from multiple established brands and provides model-specific product pages to help customers select compatible meters and strips.

You can explore:

On Call Plus
On Call Extra
Accu-Chek
Dr. Morepen
SD CodeFree
Gluneo
CareSens
Sinocare

Visit:

https://microsidd.com

and search for your exact glucometer model before ordering replacement test strips.

Final Troubleshooting Rule

When something goes wrong with a glucometer, remember:

MODEL → STRIP → ERROR → ACTION

MODEL

Identify the exact meter.

STRIP

Verify the exact compatible strip.

ERROR

Read the displayed message or symbol carefully.

ACTION

Follow the manufacturer-specific troubleshooting procedure.

This approach is safer than treating every blood glucose meter as identical.

Complete Guide Summary

This three-part Microsidd Glucometer Help Centre has covered:

First-time setup
Battery installation
Date/time setup
Coding vs no-coding meters
Lancing devices
Blood sample collection
Test-strip insertion
Blood application
Understanding results
HI and LO readings
Wrong or unexpected readings
Strip-storage problems
Battery problems
Temperature errors
Control solution testing
Cleaning and maintenance
Compatible test strips
Model-specific troubleshooting
Error-code safety
30 FAQs
Product and internal-link recommendations

The goal is to help users operate their glucose monitoring systems more confidently while understanding when a problem can be solved through basic troubleshooting and when manufacturer support or medical advice is required.

Medical Disclaimer

This Microsidd Knowledge Hub guide is provided for general educational purposes only.

Blood glucose monitoring systems differ by manufacturer, model, market version and software/firmware configuration. Information provided in the Instructions for Use supplied with your exact meter and test strips takes priority over general guidance on this page.

Error-code meanings may vary between meter models. Do not use an error-code explanation from another glucometer unless the manufacturer confirms that it applies to your exact system.

A home glucometer is intended for blood glucose monitoring and should not be used as a substitute for professional diagnosis or laboratory testing where these are required.

Do not start, stop or alter diabetes medication or another treatment solely based on information contained in this article.

Unexpectedly high or low results, persistent HI or LO readings, severe hypoglycemia or hyperglycemia symptoms, altered consciousness, seizures or other concerning symptoms require appropriate medical assessment.

Microsidd doesnt isnt states the troubleshooting will work on each and every glucometer and defer any kind of claims from whomsoever since these guidelines and troubleshooting guide, errors are been compiled from different manufacturers, contact manufacturer's user manual for final decision.

Last reviewed: August 2026