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HIV-1 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 determine if you may have been exposed to HIV.

Quick summary

["An HIV antibody screen is a crucial first step in identifying potential infection."]

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

Key facts at a glance

LOINC
12858-7
Short code
HIV1 p32 Ab Ser Ql IB
Synonyms
HIV1 p32 Ab Ser Ql IB
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ib
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 antibodies produced by your immune system after exposure to HIV. These antibodies are specific to the virus and can indicate past or recent infection. The test uses a blood sample (either serum or plasma) to identify these antibodies through an immunoassay method.

How the Test Works

Your blood sample is analyzed to detect HIV antibodies. If antibodies are present, it suggests your body has encountered the virus, though further testing is needed to confirm active infection.

Why It’s Important

Early detection of HIV is vital for managing the virus and preventing complications. This screening test helps identify potential exposure so that appropriate follow-up testing and care can begin promptly.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood. If you’re nervous, let your healthcare provider know so they can help you relax.

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 healthcare provider will likely order additional confirmatory tests (like a Western Blot or HIV-1 Qualitative PCR) to confirm HIV infection and guide treatment decisions.
A positive screening result means you should discuss further testing with your doctor to determine if you have HIV. If your result is negative, you may need retesting if you have risk factors for exposure.
How often should I get tested if I’m at risk?
If you’ve had unprotected sex, shared needles, or other behaviors that increase your risk of HIV, your doctor may recommend testing every 3–12 months, depending on your risk level. Regular testing is especially important if you’re sexually active with multiple partners or have a sexually transmitted infection.
What does a negative result mean?
A negative screening result means your blood sample did not detect HIV antibodies at this time. However, HIV can take weeks to months to develop detectable antibodies, so you may need to retest if you’ve had recent exposure. Follow your healthcare provider’s advice for next steps.
  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