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HIV-1 Antibody Test (Qualitative, Serum or 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 have been exposed to HIV.

Quick summary

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

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

Key facts at a glance

LOINC
35450-6
Short code
HIV1 p18 Ab Sal Ql IB
Synonyms
HIV1 p18 Ab Sal 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

Why This Test Is Done

Your healthcare provider may recommend this test if you have risk factors for HIV, such as unprotected sex, shared needles, or exposure to HIV through blood. It can also be part of routine testing for certain groups, like pregnant women or people with sexually transmitted infections (STIs).

What to Expect During the Test

A small amount of blood is drawn from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause much discomfort. The blood is then sent to a lab for testing.

What the Results Mean

If the test is positive, it means your body has detected HIV antibodies, suggesting past or current infection. A positive result requires further testing (like a confirmatory HIV antibody test) to confirm the diagnosis. If negative, it means no detectable antibodies were found at this time.

Preparation and Care

No special preparation is needed for this test. You can eat, drink, or take medications as usual. If you have a bleeding disorder or take blood thinners, let your provider know before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HIV Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result means your body has detected HIV antibodies, which could indicate past or current infection. You will need follow-up testing to confirm the diagnosis and receive appropriate care.
While rare, false positives can occur, especially in early infection or with certain medical conditions. Your provider will perform additional tests to confirm the result if needed.
HIV antibodies may take 2–12 weeks to develop after exposure. Some tests can detect HIV earlier, but this specific antibody test may not show results until after this window. Discuss timing with your healthcare provider based on your exposure risk.
What if my test is negative but I suspect I have HIV?
If you suspect HIV exposure but test negative, you may need to wait longer before retesting or use a more sensitive test. Consult your provider to determine the best next steps, especially if you have symptoms or ongoing risk factors.
  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