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HIV-1 Antibody Screening Test (Serum/Plasma)

Published: August 9, 2026Updated: August 17, 2026

This test detects antibodies to the human immunodeficiency virus (HIV-1) in your blood or plasma. It helps determine if you’ve been exposed to HIV.

Quick summary

["A simple blood test to check for HIV antibodies, often used as part of routine screening or after potential exposure."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
104732-3
Short code
HIV1 Ab Patrn Ser-Imp
Synonyms
HIV1 Ab Patrn Ser-Imp
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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-1 antibodies, which your immune system produces after exposure to the virus. These antibodies can appear within weeks to months after infection, though some people may test negative early on.

How the Test Works

Your blood or plasma sample is analyzed using an immunoassay method to identify HIV-1 antibodies. If present, the test indicates potential exposure, prompting further confirmatory testing.

Why It’s Done

Doctors may order this test for routine screening, especially in high-risk groups (e.g., sexually active individuals, people with multiple sexual partners, or those with sexually transmitted infections). It’s also used after potential exposure (e.g., needle stick, unprotected sex) to monitor for infection.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm for a blood draw, or a fingerstick for a quick sample. If you’re using blood thinners, inform your provider beforehand.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation required. Some tests may require follow-up confirmatory testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HIV Antibody Screen

Frequently asked questions

If your screening test is positive, your provider will likely order a confirmatory test (e.g., Western blot or nucleic acid test) to confirm HIV-1 infection. Early detection is critical for managing the virus and preventing complications.
A positive screening result means your body may have antibodies to HIV-1, but it doesn’t confirm infection alone. Follow-up testing is required for diagnosis.
What does a positive screening result mean?
A positive screening result suggests you may have been exposed to HIV-1, but it doesn’t confirm the virus is actively replicating in your body. Your provider will guide you through next steps, such as confirmatory testing.
Can I get false positives?
Yes, rare false positives can occur, especially in early infection or with certain medical conditions. Confirmatory tests are used to rule out errors and ensure accurate diagnosis.
  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 17, 2026. · Read our editorial policy