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HIV Antibody Screening Test (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 the virus. It helps screen for HIV infection, often as part of routine health checks or if you have risk factors.

Quick summary

["Screening for HIV antibodies to identify potential infection early."]

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

Key facts at a glance

LOINC
85686-4
Short code
HIV1 Ab SerPlBld Ql IF
Synonyms
HIV1 Ab SerPlBld Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
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. These antibodies are proteins your immune system makes when it encounters HIV. If present, they suggest past or current infection, though they may take weeks to develop after exposure. This test is not a test for the virus itself but for evidence of an immune response to it.

How the Test Works

Your blood or plasma sample is analyzed using an immunoassay method, which detects specific antibodies against HIV. The result helps determine if further testing (like confirmation) is needed to confirm HIV status.

Why It’s Done

Doctors perform this test to screen for HIV, especially if you have risk factors (e.g., unprotected sex, shared needles, or exposure to HIV). It’s also part of routine testing for certain groups (e.g., pregnant women, people with sexually transmitted infections). Early detection allows for timely treatment and support.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted to draw blood from a vein in your arm. If you’re nervous, let your healthcare provider know—they can offer ways to make it more comfortable.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is not diagnostic for HIV alone. A positive screening result may require additional confirmatory tests (like a Western blot or fourth-generation immunoassay) to confirm HIV infection. False positives can occur rarely, so follow-up testing is standard.

Short name

HIV Antibody Screen

Frequently asked questions

What does a positive screening result mean?
A positive screening result means your blood may contain HIV antibodies, indicating possible infection. You’ll need further testing to confirm if you have HIV. This doesn’t mean you definitely have HIV—it just means your body may have reacted to the virus.
How soon can I get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your healthcare provider will discuss the results with you and explain next steps, such as confirmatory testing if needed.
Can I have false results?
Yes, rare false positives can happen, especially if you have certain infections (e.g., hepatitis) or are pregnant. False negatives are less common but can occur if you’re tested too early after exposure (before antibodies develop). Follow-up testing will clarify the result.
  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