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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 produces in response to the virus. It helps determine if you’ve been exposed to HIV.

Quick summary

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

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

Key facts at a glance

LOINC
47452-8
Short code
FLUAV H3 Ab Titr Ser
Synonyms
FLUAV H3 Ab Titr Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 uses a fluorescent immunoassay (FIA) method to identify HIV antibodies in your blood. When HIV enters your body, it triggers an immune response, producing antibodies that your blood tests can detect. This test specifically looks for antibodies against HIV proteins, which can appear within weeks to months after exposure.

Why It’s Done

Healthcare providers may order this test if you have risk factors for HIV, such as unprotected sex, shared needles, or living with someone who has HIV. It’s also part of routine testing for certain groups (e.g., pregnant individuals, people with sexually transmitted infections).

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. The process takes about 5 minutes, and you may feel a brief pinch. If you’re pregnant or breastfeeding, let your provider know before testing.

What to Expect After the Test

You can return to your normal activities immediately. There may be a small bruise or redness at the injection site, but this usually fades within a day or two. If you experience excessive bleeding, swelling, or signs of infection (e.g., increased pain, fever), contact your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive result means your blood contains antibodies to HIV, suggesting past or current infection. A negative result means no detectable antibodies were found, but it doesn’t guarantee you’re HIV-free—false negatives can occur in early infection. Follow-up testing (e.g., viral load) may be recommended to confirm or rule out HIV. Always discuss results with your healthcare provider.

Short name

HIV Antibody Screen (FIA)

Frequently asked questions

How soon can I get my results?
Results are typically available within 1 to 3 business days. If you’re tested as part of routine screening (e.g., for pregnancy), results may be available sooner. For urgent cases, your provider may request results faster.
What does a positive result mean?
A positive result indicates you may have been exposed to HIV. You’ll need further testing (like a viral load test) to confirm infection and determine next steps, such as starting treatment. Your provider will guide you on next actions, including counseling and support.
Can I have false positives or false negatives?
Yes, both can happen. False positives are rare but possible if you have a similar infection (e.g., syphilis) or an autoimmune condition. False negatives are more likely if you were infected recently (within weeks to months) or if your immune system is suppressed. Your provider will interpret results in context with your medical history and symptoms.
  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