On Call Extra Glucometer & Test Strips Complete Guide: Features, Compatibility, Error Codes & Re-Dosing
Dr Pramod kumar
The On Call Extra Blood Glucose Monitoring System from ACON is designed for routine blood glucose monitoring using compatible On Call Extra Test Strips.
Compared with the older On Call Plus platform, On Call Extra uses a smaller blood sample, provides a faster result, does not require routine manual coding and includes features such as audible fill detection, a test-strip ejector and a short manufacturer-supported re-dosing window when the initial sample is insufficient.
This guide explains the On Call Extra glucometer, compatible test strips, 0.4 µL sample requirement, approximately 4-second testing, strip compatibility, 50 and 100-strip packs, individually foil-packed strips, re-dosing, error codes, expiry, storage and troubleshooting.
To shop the complete Extra range, visit: On Call Extra Glucometer & Test Strips Collection .
For the wider On Call family, including Plus and GK Dual, read: On Call Glucometers & Test Strips Complete Guide .
What Is the On Call Extra Glucometer?
The On Call Extra is a portable blood glucose monitoring system designed for use with compatible On Call Extra Blood Glucose Test Strips.
The meter uses electrochemical biosensor technology with a glucose oxidase based strip system. A small fresh capillary whole-blood sample is applied to the compatible strip, and the meter calculates and displays the glucose result.
The standard On Call Extra system is designed around:
- small blood sample requirements,
- fast testing,
- automatic strip calibration without routine manual coding,
- large result memory,
- longer-term glucose averages,
- audible fill detection,
- a test-strip ejector, and
- a short re-dosing capability when the first sample is insufficient.
On Call Extra Key Specifications
| Feature | On Call Extra Specification |
|---|---|
| Test type | Blood glucose |
| Sample type | Fresh capillary whole blood |
| Minimum sample size | Approximately 0.4 µL |
| Test time | Approximately 4 seconds |
| Measurement range | Approximately 10–600 mg/dL |
| Coding | No routine manual coding |
| Memory | Up to approximately 500 results with date and time |
| Averages | 7, 14, 30, 60 and 90-day averages |
| Re-dosing | Second blood application within approximately 3 seconds where permitted |
| Fill detection | Audible fill detection |
| Strip removal | Built-in test-strip ejector |
| Operating temperature | Approximately 5–45°C |
| Operating humidity | Approximately 10–90% |
| Hematocrit range | Approximately 25–60% |
Specifications can vary by product generation and market. Always follow the instructions supplied with the exact meter and test-strip pack you receive.
Which Test Strips Work with On Call Extra?
The most important compatibility rule is:
On Call Extra meter → On Call Extra Test Strips.
Do not purchase strips merely because they carry the general On Call brand name.
For example:
- On Call Extra → On Call Extra Test Strips
- On Call Plus → On Call Plus Test Strips
- On Call GK Dual → its specified glucose and ketone strip systems
On Call Plus and On Call Extra strips should not be treated as interchangeable.
For a detailed model-matching guide, read:
On Call Extra Test Strip Compatibility Guide →
Shop On Call Extra Test Strips
Microsidd currently offers several Extra strip quantities and packaging formats.
On Call Extra Test Strips 50
A standard replacement quantity for On Call Extra users.
Shop On Call Extra Test Strips 50 →
On Call Extra Test Strips 100
A larger quantity for customers with more frequent strip requirements.
Shop On Call Extra Test Strips 100 →
On Call Extra Individually Foil-Packed Test Strips
Microsidd also offers an individually foil-packed Extra strip option, where each unused strip remains separately sealed until required.
Shop On Call Extra Foil-Packed Test Strips →
To compare these options in detail, read:
On Call Extra Test Strips 50 vs 100 vs Foil Pack →
On Call Extra Glucometer Options
The On Call Extra system is available in different meter and kit configurations.
On Call Extra Complete Glucometer Kit
Shop On Call Extra Blood Glucose Monitoring System →
On Call Extra Meter Without Strips
Customers who already have compatible Extra strips may prefer a meter-only configuration.
Shop On Call Extra Glucometer Without Strips →
How Much Blood Does On Call Extra Need?
The standard On Call Extra system requires approximately 0.4 µL of fresh capillary whole blood.
This is a relatively small sample requirement and is one of the key differences between Extra and the traditional On Call Plus system.
An adequate sample still needs to reach the strip correctly. Using too little blood can prevent the test from completing normally or can lead to an insufficient-sample message.
How Fast Is On Call Extra?
After the meter accepts an adequate sample, On Call Extra typically displays the glucose result in approximately 4 seconds.
The countdown should begin only after the strip has adequately received the sample.
If testing does not begin or an error appears, do not repeatedly waste strips without checking the displayed message and sample-application procedure.
Does On Call Extra Require a Code Chip?
The standard On Call Extra system does not require routine manual coding.
ACON describes the strip system as using automatic calibration circuitry within the strip technology.
This is different from the traditional On Call Plus system, which uses a code-chip based setup.
For a direct comparison, read:
On Call Plus vs On Call Extra Glucometer Comparison →
What Is Audible Fill Detection?
On Call Extra includes audible fill detection as part of its sample-application system.
This feature helps indicate when the strip has accepted the blood sample as required for testing.
It should not be treated as a substitute for correct strip insertion, adequate sample volume or following the instructions displayed by the meter.
What Is the On Call Extra Strip Ejector?
The standard On Call Extra meter includes a test-strip ejector.
After the glucose test is complete, the ejector allows the used strip to be released from the meter without requiring the user to grasp the strip directly at the strip port.
Used strips should still be handled and discarded according to appropriate hygiene and local waste practices.
What Is On Call Extra Re-Dosing?
One of the distinctive features of the On Call Extra system is its short re-dosing capability.
If the initial blood application is insufficient, the manufacturer allows a second blood drop to be applied within approximately 3 seconds under the specified testing conditions.
This feature is intended to help reduce unnecessary strip wastage when the first sample is slightly insufficient.
However, it does not mean that:
- blood can be added repeatedly,
- blood can be added long after the meter has progressed through the test,
- a failed strip can always be rescued, or
- the same rules apply to every other glucometer.
For complete guidance, read:
On Call Extra Re-Dosing & Second Blood Sample Guide →
How to Use the On Call Extra Glucometer
Always follow the user manual supplied with your exact system. A typical test generally follows these steps:
- Wash and thoroughly dry your hands.
- Confirm you have compatible On Call Extra Test Strips.
- Insert a fresh strip correctly into the meter.
- Wait for the sample-ready indication.
- Prepare the lancing device with a new sterile lancet.
- Obtain an adequate blood drop.
- Apply approximately 0.4 µL to the strip sample area as directed.
- Allow the meter to recognise the sample.
- Use the permitted short re-dosing window only if required and instructed.
- Wait approximately 4 seconds for the result.
- Review the result.
- Eject or remove the used strip safely.
- Dispose of the used lancet appropriately.
For the full step-by-step procedure, read:
How to Use On Call Extra Glucometer & Test Strips →
On Call Extra Memory & Result Averages
The standard Extra meter can store up to approximately 500 test results with date and time.
It can also calculate averages over:
- 7 days,
- 14 days,
- 30 days,
- 60 days, and
- 90 days.
These features can help users review historical glucose measurements.
Stored readings and averages should not be used by themselves to make unsupervised medication or treatment changes.
On Call Extra Measurement Range: HI and LO
The standard On Call Extra system has a documented measurement range of approximately 10–600 mg/dL.
A result outside the meter's reportable range may appear as HI or LO rather than as an ordinary numerical result.
HI and LO should not automatically be treated as ordinary meter errors. Follow the manufacturer's instructions for repeat testing where appropriate and obtain medical advice when extreme results are confirmed.
On Call Extra Error Codes & Troubleshooting
On Call Extra can display error messages relating to:
- meter startup,
- strip insertion,
- strip removal during testing,
- blood applied too early,
- used or unsuitable strips,
- insufficient sample,
- late or incorrect re-dosing,
- battery condition,
- operating temperature, and
- internal meter operation.
Users commonly search for messages such as:
- On Call Extra E0
- On Call Extra E1
- On Call Extra E2
- On Call Extra E3
- On Call Extra E4
- On Call Extra E5
- On Call Extra meter not reading strip
- On Call Extra HI
- On Call Extra LO
- On Call Extra insufficient blood
Use the dedicated model-specific guide:
On Call Extra Error Codes & Troubleshooting Guide →
For broader multi-brand glucometer troubleshooting:
Glucometer Setup, Error Codes & Troubleshooting Guide →
On Call Extra Test Strip Expiry
Always check the expiry or use-by information printed on the actual manufacturer packaging supplied with your strips.
Do not rely on:
- an old website image,
- a previous order,
- an old invoice, or
- another customer's pack
to determine the expiry of your current batch.
Pack batches change over time as stock is replenished.
For complete storage and expiry guidance:
On Call Extra Test Strips Expiry & Storage Guide →
How Should On Call Extra Test Strips Be Stored?
On Call Extra strips are diagnostic consumables and should be stored according to the conditions printed on the actual manufacturer packaging and supplied instructions.
General good practice includes:
- keeping strips in their original manufacturer packaging,
- closing vial-packed products promptly after removing a strip,
- keeping individually foil-packed strips sealed until needed,
- protecting strips from unsuitable heat and humidity,
- avoiding contamination,
- checking expiry before use, and
- not using visibly damaged strips.
The exact product instructions should take priority over general advice.
Standard vs Individually Foil-Packed On Call Extra Strips
On Call Extra strips may be available in standard multi-strip packaging and individually foil-packed formats.
| Feature | Standard Pack | Individually Foil-Packed |
|---|---|---|
| Packaging | Multiple strips supplied together | Each strip individually sealed |
| Unused strip protection | Depends on correct shared-container handling | Each unopened strip remains sealed |
| Travel convenience | Good | Very convenient |
| Carrying a few strips | Usually requires shared packaging | Individual strips can be carried sealed |
| Compatibility | Must be On Call Extra | Must be On Call Extra |
For the complete buying comparison:
On Call Extra Test Strips 50 vs 100 vs Foil Pack →
On Call Extra vs On Call Plus
Although both are ACON On Call glucose-monitoring systems, Plus and Extra are different platforms.
| Feature | On Call Plus | On Call Extra |
|---|---|---|
| Compatible strips | On Call Plus | On Call Extra |
| Approx. sample | 1 µL | 0.4 µL |
| Approx. result time | 10 seconds | 4 seconds |
| Coding | Code-chip based | No routine manual coding |
| Approx. memory | 300 results | 500 results |
| Re-dosing | Follow Plus-specific instructions | Short manufacturer-supported re-dosing window |
Read the dedicated comparison:
On Call Plus vs On Call Extra Glucometer →
What About On Call GK Dual?
The On Call GK Dual is another separate member of the On Call family.
Unlike Extra, GK Dual is designed to support both blood glucose and blood β-ketone testing using its respective compatible strip systems.
On Call Extra Test Strips should not be assumed to work with GK Dual.
Read:
On Call GK Dual Glucose & Ketone Monitor Complete Guide →
Which On Call Extra Strip Quantity Should You Buy?
The appropriate quantity depends on your actual strip consumption, expiry management and preferred packaging format.
50 strips may suit you if:
- you prefer a standard smaller quantity,
- you want simpler stock management, or
- you do not need a larger supply.
100 strips may suit you if:
- you regularly use more than 50 strips,
- you want to reduce repeat ordering, or
- you prefer a larger supply.
Foil-packed strips may suit you if:
- you travel frequently,
- you want individual strip packaging,
- you prefer each unused strip to remain separately sealed, or
- individual packaging is convenient for your workflow.
Compare them here:
On Call Extra 50 vs 100 vs Foil Pack Guide →
Why Is My On Call Extra Meter Not Reading the Strip?
If the meter does not recognise an inserted strip, check:
- Is the meter actually On Call Extra?
- Is the strip specifically compatible with On Call Extra?
- Is the strip inserted in the correct direction?
- Is the strip fully inserted?
- Is it new and undamaged?
- Is it within its applicable expiry?
- Was it stored correctly?
- Does the meter have adequate battery power?
- Is there an error message on the display?
If an E-code appears, use:
On Call Extra Error Codes & Troubleshooting Guide →
Why Did My On Call Extra Test Not Start?
Possible reasons include:
- blood applied before the meter was ready,
- insufficient sample,
- sample applied to the wrong part of the strip,
- used or contaminated strip,
- incorrect strip family,
- strip removed or moved during testing, or
- meter operating outside suitable conditions.
Note the exact message shown before discarding the strip because that can make troubleshooting more precise.
When Is a Control Solution Test Useful?
A control solution test is used to check whether the meter-and-strip system is working within the applicable control range.
Follow the On Call Extra manufacturer's instructions regarding circumstances where control testing is recommended, such as when system performance is in question or a strip-storage problem is suspected.
Control solution is not blood and a control result should not be interpreted as a personal glucose measurement.
Where to Buy On Call Extra Glucometer & Test Strips
Microsidd carries On Call Extra meters and compatible strip options for delivery across India, subject to current availability.
- On Call Extra Glucometer Kit
- On Call Extra Glucometer Without Strips
- On Call Extra Test Strips 50
- On Call Extra Test Strips 100
- On Call Extra Foil-Packed Test Strips
View all Extra products together:
On Call Extra Glucometer & Test Strips Collection →
Why Buy On Call Extra from Microsidd?
Microsidd India supplies blood glucose monitoring products to individual customers, healthcare professionals, clinics and laboratories.
- Genuine On Call / ACON product supply
- On Call Extra meter and strip options
- 50 and 100-strip quantities
- Individually foil-packed Extra strips
- Compatibility-focused product information
- Knowledge Hub guides for setup and troubleshooting
- Competitive online pricing
- Delivery across India
- GST invoice available where applicable
Customers in Bengaluru can also learn more about Microsidd India, RT Nagar, Bengaluru → .
Frequently Asked Questions
Which strips work with the On Call Extra glucometer?
Use compatible On Call Extra Blood Glucose Test Strips. Do not substitute On Call Plus strips simply because they share the same brand.
How much blood does On Call Extra require?
The standard system requires approximately 0.4 µL of fresh capillary whole blood.
How long does On Call Extra take to show a result?
A glucose result is typically displayed in approximately 4 seconds after an adequate sample is accepted.
Does On Call Extra need a code chip?
The standard system does not require routine manual coding. The strip platform uses automatic calibration circuitry.
How many readings does On Call Extra store?
The standard meter stores up to approximately 500 results with date and time.
Which averages does On Call Extra calculate?
The standard meter supports approximately 7, 14, 30, 60 and 90-day averages.
Can I add more blood if the first sample is too small?
On Call Extra supports a manufacturer-specified short re-dosing window of approximately 3 seconds when the initial sample is insufficient. Follow the meter instructions rather than repeatedly adding blood.
What does HI mean on On Call Extra?
HI indicates a result above the meter's upper reportable range. Follow the manufacturer instructions for repeat testing and seek medical advice if an extreme result is confirmed.
What does LO mean on On Call Extra?
LO indicates a result below the meter's lower reportable range. Follow the manufacturer instructions and obtain appropriate medical assistance when a severely low result is confirmed or concerning symptoms are present.
Can On Call Plus strips be used in On Call Extra?
No. On Call Plus and On Call Extra use their own compatible strip families.
Are foil-packed On Call Extra strips compatible?
Yes, where the product is specifically labelled as compatible with the On Call Extra system.
Where can I buy On Call Extra strips in India?
Microsidd offers compatible On Call Extra strips in standard and selected foil-packed formats for online ordering and delivery across India, subject to current availability.
Related On Call Extra Guides
- On Call Extra Error Codes & Troubleshooting Guide
- On Call Extra Test Strip Compatibility Guide
- How to Use On Call Extra Glucometer & Test Strips
- On Call Extra Re-Dosing & Second Blood Sample Guide
- On Call Extra Test Strips Expiry & Storage Guide
- On Call Extra Test Strips 50 vs 100 vs Foil Pack
- On Call Plus vs On Call Extra Glucometer Comparison
- On Call Plus, Extra & GK Dual Complete Guide
Medical information notice: This article provides product information, compatibility guidance and general operating information for the On Call Extra blood glucose monitoring system. It does not diagnose diabetes, interpret an individual's glucose result or replace the user manual supplied with the meter and strips.
Your healthcare professional should determine your glucose targets, testing frequency and treatment plan. Do not change medication, insulin or other treatment solely on the basis of general information in this article.
If a glucose result is unexpectedly high or low, repeat the test according to the manufacturer's instructions where appropriate. Repeated extreme readings, severe symptoms, confusion, loss of consciousness or inability to self-treat require prompt medical assessment. Do not delay necessary medical care while troubleshooting the meter.