Skip to content

Serum or Plasma Immunoassay for Anti-Human Immunodeficiency Virus (HIV) Antibodies (Qualitative)

Published: August 9, 2026Updated: August 16, 2026

This test checks for antibodies to the human immunodeficiency virus (HIV), which your immune system makes in response to the virus. Antibodies can appear in your blood after infection, often within weeks to months.

Quick summary

["Determines if you’ve been exposed to HIV, helping guide prevention, testing, or treatment decisions."]

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

Key facts at a glance

LOINC
31431-0
Short code
HTLV I+II IgG Ser Ql
Synonyms
HTLV I+II IgG Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 detects specific proteins (antibodies) produced by your immune system in response to HIV. These antibodies are a sign that your body has encountered the virus, though they may not appear immediately after exposure. The result helps determine if HIV is present in your system.

How the Test Works

Your blood sample is analyzed using an immunoassay method, which identifies the presence of HIV antibodies. This test is typically qualitative, meaning it only tells whether antibodies are present or not, rather than measuring their exact amount.

Why It’s Done

Healthcare providers use this test to screen for HIV, confirm a positive result from an initial screening, or monitor individuals who may have been exposed to the virus. It’s also used in routine testing for people at higher risk of HIV.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted into your arm to draw blood, which usually takes a few minutes. If you’re nervous, let your healthcare provider know—they can offer comfort measures.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

HIV Antibody Test

Frequently asked questions

How soon can I get results after the test?
Results are typically available within 1 to 3 business days, depending on lab processing times. Your healthcare provider will contact you directly with the results.
What does a positive result mean?
A positive result means your blood test detected HIV antibodies, indicating you may have been infected. This does not confirm HIV infection immediately—you may need further testing for confirmation. Follow-up steps will be guided by your healthcare provider.
Can I still be at risk for HIV even if my antibody test is negative?
Yes, a negative antibody test does not guarantee you are not infected. HIV can take weeks to months to produce detectable antibodies. If you’ve been exposed, consider getting tested again after 3 months or consult your healthcare provider for guidance.
  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