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HIV-1 Antibody Screening and Confirmation Test (Serum/Plasma)

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

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

Quick summary

["Early detection of HIV antibodies is critical for managing your health and accessing treatment options."]

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

Key facts at a glance

LOINC
33508-3
Short code
HIV1 p65+p66 Ab Ser Ql IB
Synonyms
HIV1 p65+p66 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 sexual contact, sharing needles, or other behaviors that increase exposure risk. It may also be part of routine testing for certain groups or during pregnancy.

How the Test Works

The test uses a blood sample (either serum or plasma) to identify antibodies against HIV. The process involves detecting these antibodies through a specialized immunoassay method, which can be either qualitative (yes/no) or confirmatory for further verification.

Sample Collection and Preparation

A small amount of blood is drawn from a vein, usually in your arm. The blood is then processed to separate the serum or plasma for testing.

Test Results and Interpretation

Results are typically reported as either positive (indicating potential HIV exposure) or negative (no detectable antibodies). A positive result requires further confirmation testing to ensure accuracy.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HIV Antibody Test

Frequently asked questions

What does a positive result mean?
A positive result suggests that your body may have detected HIV antibodies, indicating possible exposure. You will need follow-up testing to confirm the result and receive appropriate medical guidance.
How soon after exposure can I get tested?
HIV antibodies may take several weeks to develop after exposure. Some tests can detect HIV earlier, but standard antibody screening may not show results until at least 2-3 weeks post-exposure. Discuss timing with your healthcare provider based on your risk factors.
Is this test the same as a viral load test?
No, this test detects antibodies to HIV, while a viral load test measures the amount of active virus in your blood. Both tests serve different purposes in HIV diagnosis and monitoring.
  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