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Human Immunodeficiency Virus (HIV) Antibody Screening by Immunoassay

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

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

Quick summary

["HIV antibody tests screen for past or recent exposure to the virus that causes AIDS."]

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

Key facts at a glance

LOINC
33590-1
Short code
Hu IgG CSF-aCnc
Synonyms
Hu IgG CSF-aCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

What This Test Measures

The test looks for HIV antibodies in your blood or plasma. Antibodies are proteins your immune system produces after exposure to HIV. They can appear within weeks to months after infection, though results may take longer in some cases.

How the Test Works

This test uses an immunoassay method, which detects specific antibodies against HIV. Your sample is tested to see if it reacts with HIV antigens, indicating a possible infection.

Why It’s Done

Doctors may order this test if you have symptoms of HIV, such as fever, fatigue, or swollen lymph nodes, or if you’ve had unprotected sex or shared needles with someone who tested positive. It’s also part of routine screening for high-risk groups.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm or hand to draw blood. If you’re tested for HIV in a clinic, you might also receive counseling about the results and next steps.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for early detection of HIV, allowing for prompt treatment and management. Early diagnosis improves health outcomes and reduces the risk of spreading the virus to others. Results should always be interpreted by a healthcare provider in the context of your medical history and symptoms.

Short name

HIV Antibody Test

Frequently asked questions

How soon can I get results from this test?
Results are typically available within 1 to 3 days, but some labs may take longer. If you’re tested as part of a routine screening, you may receive results sooner. Follow-up testing (like a confirmatory test) may be needed if initial results are positive.
What does a positive result mean?
A positive result means your test detected HIV antibodies, suggesting you’ve been infected. This does not confirm the diagnosis alone—additional testing is required to confirm HIV infection. A healthcare provider will guide you on next steps, including follow-up tests and treatment options.
Can I still be infected if my test is negative?
Yes, it’s possible. HIV antibodies may take weeks to months to develop after exposure. If you suspect you’ve been exposed, ask your doctor about repeat testing or other diagnostic methods, such as viral load testing, to check for active infection.
  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