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HIV Antibody Screening and Confirmation (gp36 Antigen)

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies to the human immunodeficiency virus (HIV), which your body makes in response to infection. It helps determine if you have been exposed to HIV.

Quick summary

["HIV antibody testing is crucial for early detection and management of infection."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
10902-5
Short code
HIV2 gp36 Ab Ser Ql IB
Synonyms
HIV2 gp36 Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
CPT
86701
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may recommend this test if you have risk factors for HIV, such as unprotected sex, shared needles, or other behaviors that increase exposure. It may also be part of routine screening for certain groups, like sexually active adults or those with sexually transmitted infections.

How the Test Works

The test uses a blood sample to detect HIV antibodies, specifically targeting the gp36 protein—a marker of HIV infection. The sample is analyzed using an immunoassay method to identify the presence of these antibodies.

Sample Collection and Preparation

A small amount of blood is drawn from your arm. The blood is processed to separate the serum or plasma, which is then tested for HIV antibodies.

Test Results and Interpretation

Results are reported as either positive (indicating possible HIV infection) or negative (no detectable antibodies). A positive result requires confirmation with another test to avoid false positives.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HIV Antibody Test (Screen & Confirm)

Frequently asked questions

What Does a Positive Result Mean?
A positive result means your blood contains antibodies to HIV, suggesting you may have been infected. Follow-up testing is needed to confirm the diagnosis and guide next steps, such as starting antiretroviral therapy.
How Often Should I Get Tested?
The frequency depends on your risk factors. The CDC recommends HIV testing at least once every 6 months for high-risk individuals or annually for others. Discuss testing with your provider based on your health and lifestyle.
What If My Test Is Negative but I Suspect I Was Exposed?
If you suspect recent exposure (within 90 days), your provider may recommend a follow-up test or a shorter window test to check for HIV antibodies earlier than standard screening.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy