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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 infection. It helps determine if you have been exposed to HIV.

Quick summary

["This screening test is the first step in diagnosing HIV infection."]

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

Key facts at a glance

LOINC
30361-0
Short code
HIV 2 Ab SerPl Ql IA
Synonyms
HIV 2 Ab SerPl Ql IA
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 have been infected with HIV, your body will produce these antibodies over time.

How the Test Works

Your blood or plasma sample is analyzed using an immunoassay method. This detects specific antibodies against HIV if they are present in your system. The result helps determine whether further testing is needed for confirmation.

Why It’s Done

HIV antibody screening is typically performed as part of routine health check-ups, especially if you are at higher risk for HIV infection (e.g., unprotected sexual contact, shared needles, or living in areas with higher HIV prevalence). It can also be done if you notice symptoms that might suggest HIV, such as unexplained weight loss, frequent illnesses, or fatigue.

What to Expect Before the Test

No special preparation is needed for this test. You may have a small needle inserted into your arm to draw blood. If you are nervous, let your healthcare provider know so they can help make the process more comfortable.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

HIV Antibody Screen

Frequently asked questions

If your HIV antibody screen comes back positive, your healthcare provider will likely order additional confirmatory tests, such as a Western blot or a nucleic acid test, to confirm the diagnosis. Early detection is crucial for managing HIV and improving health outcomes.
An HIV antibody screen can detect infection approximately 2 to 8 weeks after exposure, depending on when antibodies develop in your body. If you suspect you may have been exposed to HIV, it’s important to get tested as soon as possible.
What does a positive result mean?
A positive result means your test detected HIV antibodies, which suggests you may have been infected. This result will need to be confirmed with additional tests by your healthcare provider to ensure accuracy. Early treatment can help manage the infection effectively.
Can I still have sex or use needles after a positive screen result?
Yes, but you should discuss this with your healthcare provider immediately. They will guide you on next steps, including whether you need further testing or treatment. It’s important to protect yourself and others by avoiding high-risk behaviors until you receive confirmation and treatment, if needed.
  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