HIV rapid tests can appear simple to perform, but obtaining a reliable result depends on following the correct procedure from specimen collection through result interpretation.

Using the wrong specimen volume, adding the wrong amount of buffer, reading the test too early or too late, using an expired device or interpreting a test without a valid control can all affect the reliability of the result.

This guide explains the correct professional workflow for using an HIV rapid test kit, with specific reference to the Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit.

Important: The exact specimen quantity, buffer quantity and interpretation time must always be taken from the Instructions for Use supplied with the exact test kit and manufacturing batch. These values should never be borrowed from another HIV rapid-test product simply because the cassettes look similar.

What Is the Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit?

The Microsidd HIV Antibody Rapid Test Kit is a professional-use rapid in vitro diagnostic screening test for the qualitative detection of antibodies to:

• HIV-1
• HIV-2

The current Microsidd product information lists the following permitted specimen types:

• Whole blood
• Serum
• Plasma

The test uses lateral-flow immunochromatographic technology and is intended for use by trained healthcare professionals and laboratory personnel.

For a broader explanation of HIV antibodies, HIV-1 versus HIV-2, the window period and screening versus diagnosis, first read:

HIV Rapid Test Kit Complete Guide: Screening, Results & Confirmatory Testing

Before Using an HIV Rapid Test Kit

Before opening the test pouch, verify that the exact test kit is suitable for the intended application.

Check:

• Product name
• Manufacturer or marketer
• Lot or batch number
• Expiry date
• Integrity of the foil pouch
• Permitted specimen type
• Storage history
• Availability of the correct buffer
• Availability of the current package insert / Instructions for Use

Do not use a test after its expiry date or if the individual foil pouch is damaged, open or otherwise compromised.

Why the Exact HIV Test Instructions Matter

Different HIV rapid tests can look almost identical but require different operating procedures.

Differences can include:

• Specimen type
• Specimen volume
• Blood collection method
• Number or volume of buffer drops
• Location where specimen is added
• Incubation or migration time
• Permitted interpretation window
• Result-line configuration
• Storage temperature

Therefore:

Never use instructions from another HIV kit, a photograph on the internet, another rapid-test cassette or a previous product simply because it looks similar.

What Do You Need Before Starting?

Depending on the exact kit configuration and specimen type, the testing area may require:

• HIV rapid-test device
• Manufacturer-supplied buffer
• Specimen-transfer device or dropper
• Appropriate blood-collection equipment
• Disposable gloves
• Timer
• Suitable disinfectant
• Biohazard-waste container
• Sharps container when lancets or needles are used
• Patient/sample identification system
• Current Instructions for Use

The exact contents supplied in the HIV test package can vary by pack configuration, so verify the actual contents before beginning.

Step 1 — Verify the HIV Test Kit

Before testing, inspect the kit carefully.

Confirm that:

• The correct HIV product has been selected
• The test is within its expiry date
• The foil pouch is intact
• The test has been stored according to its labelled conditions
• The correct buffer supplied or specified for the assay is available
• The package insert corresponds to the test being used

Do not interchange buffer between unrelated rapid-test products unless the manufacturer specifically authorizes it.

Step 2 — Prepare a Clean Testing Area

HIV testing involves potentially infectious human specimens. Testing should therefore be performed using appropriate biosafety precautions.

The work area should be:

• Clean
• Dry
• Stable
• Well illuminated
• Protected from contamination

Food, drinks and smoking should be kept away from areas where human specimens and diagnostic tests are handled.

Wear appropriate personal protective equipment and follow the infection-control procedures applicable to the healthcare or laboratory setting.

Step 3 — Confirm Patient and Specimen Identification

Correct analytical performance is useless if the result is assigned to the wrong person.

Before collecting or testing a specimen:

• Verify patient identification according to the facility's procedure
• Label the specimen where applicable
• Label or identify the rapid-test device appropriately
• Avoid handling multiple unlabelled specimens simultaneously

Confidentiality is especially important in HIV testing.

Step 4 — Select the Correct Specimen Type

The current Microsidd HIV antibody product information lists:

• Whole blood
• Serum
• Plasma

Use only a specimen type permitted by the Instructions for Use.

Do not assume that saliva, urine or another biological sample can be used simply because certain other HIV tests use different specimen types.

Using Whole Blood

Whole blood may be obtained according to the specimen-collection procedure allowed by the exact test kit and local laboratory protocol.

When capillary blood collection is permitted, appropriate single-use equipment and infection-control procedures should be followed.

When venous whole blood is used, the correct collection tube and anticoagulant requirements should be determined from the manufacturer's instructions.

Using Serum or Plasma

When serum or plasma is used, the specimen should be collected, prepared, stored and handled according to accepted laboratory procedures and the requirements of the test manufacturer.

Do not substitute serum, plasma and whole blood volumes unless the Instructions for Use specifically state the required quantity for each specimen type.

Step 5 — Open the HIV Rapid-Test Pouch

Open the sealed foil pouch according to the manufacturer's instructions and remove the rapid-test device.

Place the cassette on a clean, flat and stable surface.

Once opened, the test should be used within the period specified by the manufacturer. Do not leave an opened cassette exposed for an extended period before testing.

Step 6 — Apply the Correct Amount of Specimen

Transfer the specimen to the designated sample area of the HIV rapid-test device.

Use exactly the specimen quantity specified in the package insert supplied with the test.

Do not estimate the quantity visually unless the supplied transfer device is specifically designed to deliver the required volume.

Why Is Sample Volume Important?

Too little specimen may cause insufficient migration or unreliable test performance.

Too much specimen may interfere with normal lateral flow, overwhelm the sample area or produce an invalid or difficult-to-interpret test.

This is why instructions such as "one drop" cannot automatically be transferred between different droppers or different HIV-test products: drop volumes can differ.

Step 7 — Add Buffer Exactly as Directed

If the HIV kit requires buffer, add the manufacturer-specified amount to the designated location.

Do not add extra buffer simply to make the sample move faster.

Likewise, insufficient buffer can interfere with proper migration through the membrane.

Use only the correct buffer supplied or specifically identified for the test.

Do not substitute:

• Water
• Saline
• Buffer from another rapid test
• Buffer from another product lot unless allowed by the manufacturer

Step 8 — Start the Timer

Timing should begin at the point specified in the manufacturer's procedure, typically after the specimen and required buffer have been applied.

Use a timer rather than estimating the time.

The current public Microsidd HIV antibody product page does not specify a numeric reading time. Therefore, the correct interpretation time should be taken from the package insert supplied with the exact test.

Why Should the Test Not Be Read Too Early?

Lateral-flow reactions require sufficient time for specimen migration and interaction with the assay reagents.

Reading before the manufacturer's minimum interpretation time can produce an incomplete result.

Why Should the Test Not Be Read Too Late?

Rapid-test manufacturers specify an interpretation window because visual changes that occur after the permitted period may not represent a valid test result.

A line appearing long after the manufacturer's reading window should therefore not automatically be interpreted as a Reactive test.

Read and document the result only within the interpretation period defined in the exact Instructions for Use.

Step 9 — Check the Control Before Interpreting the HIV Result

The control indicator is essential for determining whether the rapid test has functioned according to its design.

Before interpreting the test area, confirm that the required control indicator has appeared in the position specified by the manufacturer.

If the required control does not appear, the test should be regarded as Invalid regardless of what appears elsewhere on the cassette.

Do not report an Invalid test as either Reactive or Non-Reactive.

Step 10 — Interpret the Test According to the Exact Kit Diagram

The result-line pattern must be interpreted using the diagram supplied with the exact HIV test.

Rapid-test designs vary. Some devices contain a single test region, while others may use multiple test regions or distinguish HIV-1 and HIV-2 responses differently.

For that reason, never interpret the Microsidd HIV antibody test using an online photograph of another HIV cassette.

What Does a Non-Reactive HIV Rapid Test Mean?

A Non-Reactive result means the HIV marker targeted by the assay was not detected under the conditions of that test.

However, a Non-Reactive result should always be considered together with:

• Timing since possible exposure
• The type of HIV test used
• The specimen type
• Whether the test procedure was performed correctly
• Whether repeat testing is recommended

Testing performed during the HIV window period may not detect a recent infection.

What Does a Reactive HIV Rapid Test Mean?

A Reactive result means the assay has detected the HIV-related marker targeted by the screening test.

A single Reactive HIV rapid screening test should not automatically be reported to the patient as a confirmed HIV-positive diagnosis.

Further testing should proceed according to the applicable national HIV testing algorithm.

Read the dedicated guide:

HIV Rapid Test: Reactive vs Non-Reactive Results

What Does an Invalid HIV Rapid Test Mean?

An Invalid test has not produced the required validity indicator defined by the manufacturer.

Possible causes may include:

• Insufficient specimen
• Incorrect procedure
• Incorrect buffer quantity
• Improper migration
• Damaged test device
• Expired test
• Incorrect storage
• Other product-specific factors

Do not attempt to convert an Invalid result into a Reactive or Non-Reactive interpretation.

Follow the manufacturer's instructions regarding repeat testing using a new device.

Step 11 — Record the HIV Screening Result

Results should be recorded according to the healthcare facility's documentation procedure.

Relevant documentation may include:

• Patient or specimen identifier
• Date and time of testing
• Test result
• Kit name
• Lot or batch number
• Expiry date
• Operator identification
• Quality-control information where applicable

HIV-related information should be handled with appropriate confidentiality.

Step 12 — Dispose of the Used Test Safely

A used rapid-test cassette, collection device and blood-contaminated materials should be treated according to applicable biomedical-waste and infection-control procedures.

Used lancets, needles and other sharps should be placed directly into an appropriate sharps container.

Do not:

• Reuse lancets
• Reuse single-use test devices
• Recap or handle used sharps unnecessarily
• Leave blood-contaminated materials exposed

Quick Professional HIV Rapid-Test Workflow

Step	Action
1	Verify test identity, pouch integrity, lot and expiry.
2	Review the current manufacturer Instructions for Use.
3	Prepare a clean testing area and appropriate PPE.
4	Confirm patient and specimen identification.
5	Collect an approved specimen: whole blood, serum or plasma as applicable.
6	Place the exact specified specimen quantity into the designated sample area.
7	Add the exact quantity of the correct buffer if required.
8	Start the timer.
9	Read only within the manufacturer's permitted interpretation window.
10	Verify the control before interpreting the test result.
11	Report as Reactive, Non-Reactive or Invalid according to the exact IFU.
12	Document the result and dispose of contaminated materials safely.

Common HIV Rapid-Test Procedure Errors

Common mistakes that can compromise rapid-test reliability include:

• Using an expired test
• Using a test from a damaged pouch
• Using the wrong specimen
• Applying too much or too little specimen
• Using an incorrect dropper
• Adding too much or too little buffer
• Using buffer from another product
• Reading the cassette too early
• Reading the cassette after the interpretation window
• Ignoring an absent control indicator
• Using a test stored outside its permitted conditions
• Using the same device more than once
• Interpreting a screening Reactive result as a final diagnosis

These errors will be explored further in:

HIV Rapid Test Do's, Don'ts & Common Errors

Can You Add More Blood If the Test Does Not Run Properly?

Do not automatically add more specimen to a test that appears to be running incorrectly.

Adding extra blood after the procedure has started may alter the specimen-to-buffer ratio or interfere with membrane migration.

If the test becomes Invalid, follow the exact repeat-testing instructions supplied by the manufacturer.

Can You Add More Buffer to Make the Test Run?

Do not add additional buffer unless the manufacturer's procedure specifically instructs you to do so.

An apparently slow test should not be "rescued" by randomly adding additional buffer.

If a procedural error has occurred, repeating the test correctly with a new device is generally more appropriate than modifying a completed procedure.

Can Buffer from Another Rapid Test Be Used?

No substitution should be made unless specifically authorised by the manufacturer.

Buffers may contain different chemical formulations designed for a particular assay.

A bottle supplied with an HBsAg, HCV, syphilis, pregnancy or another HIV test should not automatically be considered interchangeable.

Can a Used HIV Test Cassette Be Reused?

No.

The Microsidd HIV antibody rapid-test device is intended for single use only.

Once specimen has migrated through the membrane, the device cannot be reset, cleaned or reliably reused.

Should a Faint Test Line Be Ignored?

Do not decide the meaning of a faint line using a generic rule from another test.

Interpret any visible reaction only according to:

• The exact test's result diagram
• The manufacturer's definition of a Reactive result
• The permitted interpretation time
• The presence of the required control indicator

The dedicated result-interpretation guide will examine this issue in more detail:

HIV Rapid Test Reactive vs Non-Reactive: How Results Are Interpreted

Does a Correctly Performed Non-Reactive Test Rule Out Very Recent HIV Infection?

Not necessarily.

Even when a rapid test is performed perfectly, an antibody test can be Non-Reactive when testing occurs before sufficient antibodies have become detectable.

This is known as the window period.

The correct procedure therefore answers:

"Was this rapid test performed correctly?"

It does not by itself answer:

"Was this test performed at the correct time after a particular exposure?"

Both factors matter.

Does a Reactive HIV Rapid Test Need Additional Testing?

Yes.

A single Reactive screening test should proceed through the applicable HIV testing algorithm.

Current international guidance uses combinations of distinct assays to establish an HIV-positive diagnosis rather than relying on one screening device alone.

Learn more:

HIV Screening Test vs Confirmatory Testing: What Is the Difference?

HIV Rapid Testing During Pregnancy

HIV screening is an important component of antenatal infection screening.

Early identification allows appropriate treatment, counselling and interventions intended to reduce vertical transmission from mother to child.

For the pregnancy pathway, read:

• Pregnancy Confirmed? First Antenatal Visit & Important Screening Tests
• Antenatal Infection Screening: HIV, Syphilis, Hepatitis B & HCV
• HIV Testing During Pregnancy & Antenatal Care

HIV Testing: Procedure and Diagnosis Are Different Questions

It is useful to separate three stages:

Stage 1 — Performing the rapid test correctly
Correct specimen + correct volume + correct buffer + correct timing.

Stage 2 — Interpreting the rapid screening result correctly
Reactive + Non-Reactive + Invalid according to the exact IFU.

Stage 3 — Establishing HIV status according to the testing algorithm
A Reactive initial screening result proceeds to the additional testing required by the applicable national strategy.

A perfectly performed screening test can still require additional testing before an HIV diagnosis is established.

Frequently Asked Questions

How much blood should be added to the Microsidd HIV rapid test?

Use the exact specimen quantity stated in the Instructions for Use supplied with the specific test batch. The current public Microsidd product page confirms whole blood, serum and plasma as permitted specimens but does not publicly specify a universal numeric specimen volume. Do not copy the volume from another HIV test.

How many drops of buffer should I add?

Use only the exact quantity stated in the package insert supplied with the test. Buffer-drop requirements can differ between rapid-test products, and using an incorrect quantity may affect test migration and validity.

How long should I wait before reading an HIV rapid test?

Read the test only within the interpretation window specified in the exact manufacturer's Instructions for Use. Do not assume that the timing of another HIV cassette applies to this test.

Can I use whole blood with the Microsidd HIV antibody rapid test?

Yes. The current product information lists whole blood, serum and plasma as accepted specimen types. The collection and application method should follow the package insert.

Can I use serum?

Yes, serum is listed as an accepted specimen type for the current Microsidd HIV antibody test.

Can I use plasma?

Yes, plasma is also listed as an accepted specimen type. Follow the manufacturer's specimen-handling instructions.

Can I use saliva or urine?

Not unless the exact test's Instructions for Use specifically list that specimen. The current Microsidd HIV antibody product information lists whole blood, serum and plasma.

What happens if I add too much buffer?

Excess buffer can alter test migration and may compromise the procedure. Do not attempt to correct an incorrectly performed assay by improvising. Follow the manufacturer's instructions regarding repeat testing.

What happens if the control line does not appear?

The test is Invalid if the manufacturer's required control indicator is absent. Do not interpret the test as Reactive or Non-Reactive.

Can I read the HIV test after several hours?

No. Interpret the test only within the manufacturer's defined reading window. Changes occurring after that period should not be used for clinical interpretation.

Can I reuse the HIV cassette?

No. The Microsidd HIV antibody rapid-test cassette is a single-use device.

Can a Reactive rapid test confirm HIV?

No. A single Reactive HIV screening result should proceed through the applicable HIV testing algorithm before a confirmed diagnosis is established.

Can a Non-Reactive result exclude a recent exposure?

Not necessarily. Testing during the HIV window period may produce a Non-Reactive result because the marker targeted by the assay has not yet reached detectable levels.

Is this HIV test intended for home self-testing?

The main Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit is described in its current product information as a professional in vitro diagnostic test intended for trained healthcare and laboratory personnel. It should therefore be used according to its professional-use instructions.

Continue Through the Microsidd HIV Rapid Testing Hub

• HIV Rapid Test Kit Complete Guide
• HIV Rapid Test: Reactive vs Non-Reactive Results
• HIV Rapid Test Do's, Don'ts & Common Errors
• HIV Rapid Test Storage & Expiry Guide
• HIV Screening vs Confirmatory Testing
• HIV Testing During Pregnancy & Antenatal Care

Buy the Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit

Healthcare professionals, diagnostic laboratories, hospitals and other professional users can view the current product here:

Microsidd HIV 1 & HIV 2 Antibody Rapid Test Kit

Always verify the product, pack configuration, intended use, expiry date and current Instructions for Use before testing.

Medical Information Notice

This article is intended for general educational and professional product-information purposes and does not replace the manufacturer's Instructions for Use, laboratory standard operating procedures, HIV counselling, clinical evaluation or national HIV testing guidelines.

The exact specimen quantity, buffer quantity, waiting time, result-reading window, storage conditions and detailed result pattern must be taken from the package insert supplied with the exact HIV test kit being used.

A single Reactive HIV rapid screening result should not be treated as a confirmed HIV diagnosis. Appropriate additional testing should be performed according to the applicable HIV testing algorithm.

A Non-Reactive result may not exclude recent HIV infection when testing occurs during the window period. Individuals with a recent potential exposure, a Reactive result, an Invalid result or uncertainty about testing should obtain appropriate professional evaluation and follow-up.