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Fluorescent Immunoassay for Anti-Human Immunodeficiency Virus (HIV) Antibodies (Qualitative)

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

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

Quick summary

["This screening test checks for HIV antibodies to identify possible infection early."]

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

Key facts at a glance

LOINC
39307-4
Short code
FLUAV H6 Ab Titr Ser HAI
Synonyms
FLUAV H6 Ab Titr Ser HAI
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
hai
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

What This Test Measures

The test looks for HIV antibodies in your blood or plasma. If your body has been exposed to HIV, it produces antibodies against the virus. This test detects those antibodies using a fluorescent immunoassay, which is highly sensitive and specific.

How the Test Works

A small blood sample is taken from your arm. The sample is tested in a lab to detect HIV antibodies. If antibodies are present, they bind to HIV antigens on a test strip, and a fluorescent marker signals a positive result.

Why It’s Done

Doctors may recommend this test if you have risk factors for HIV (e.g., unprotected sex, shared needles, or exposure to infected blood), symptoms of infection, or if you’re part of a group at higher risk. It’s also used as part of routine screening in some settings.

What to Expect Before the Test

No special preparation is needed. You may have a small bruise or slight discomfort from the needle, but this usually goes away quickly. Avoid alcohol before the test if possible, as it may affect blood clotting.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HIV Antibody Screen (Qualitative)

Frequently asked questions

How long after exposure might this test show results?
HIV antibodies typically appear within 2–12 weeks after exposure, but some people may not develop detectable antibodies for months. A positive result means you may have HIV, and further testing (like a viral load test) is needed to confirm infection and guide treatment.
Can false results occur?
False results are rare but possible. False negatives can happen if tested too early after exposure. False positives may occur rarely due to other infections or lab errors. Your doctor will discuss results and next steps if needed.
What does a positive result mean?
A positive result indicates you may have HIV. You’ll need follow-up testing to confirm infection and start appropriate care. Treatment can help manage the virus and improve your health, even if HIV is present.
  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