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HIV Antibody Screening by Immunoassay (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 infection. 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
35438-1
Short code
HIV1 Ab Sal IA-aCnc
Synonyms
HIV1 Ab Sal IA-aCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
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

What This Test Measures

The test looks for HIV antibodies in your blood or plasma. Antibodies are proteins your immune system makes to fight infections. If you’ve been exposed to HIV, your body may produce these antibodies within weeks to months after exposure.

How the Test Works

This test uses an immunoassay method to detect HIV antibodies. A small blood sample is taken, usually from your arm, and analyzed in a lab. The lab checks for specific markers that indicate the presence of HIV antibodies.

Why It’s Done

Doctors may recommend this test if you have risk factors for HIV, such as unprotected sex, shared needles, or other behaviors that increase exposure risk. It’s also part of routine testing for certain groups (e.g., pregnant women, people with sexually transmitted infections).

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. The process takes a few minutes, and you can usually return to normal activities afterward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HIV Antibody Screen

Frequently asked questions

If antibodies are found, further testing (like a confirmatory HIV test) is needed to confirm HIV infection. Early detection is crucial for managing the virus and preventing complications.
A positive result means your body has detected HIV antibodies, which may indicate past or current infection. Follow-up testing is required to confirm diagnosis and guide treatment.
What does a negative result mean?
A negative result means no HIV antibodies were detected in this test. However, HIV can sometimes take weeks to months to produce detectable antibodies. If you suspect exposure, repeat testing or consult a healthcare provider for guidance.
How soon after exposure can I get tested?
HIV antibodies may appear as early as 2–4 weeks after exposure, but some people may not test positive until 3–6 months. Testing at recommended intervals (e.g., 3 months post-exposure) is advised for accurate results.
  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