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HIV Antibody Screening Test (Qualitative) – p24 Antigen/ Antibody Detection

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

This test checks for antibodies and the p24 protein, which are signs of HIV infection, using a blood sample. It helps determine if you have been exposed to the virus.

Quick summary

["A simple blood test to detect early signs of HIV infection, often used as part of routine screening or after potential exposure."]

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

Key facts at a glance

LOINC
21337-1
Short code
HIV2 gp34 Ab Ser Ql IB
Synonyms
HIV2 gp34 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

How the Test Works

Your blood sample is tested for HIV antibodies and the p24 protein using a sensitive immunoassay method. This detects the virus’s presence even before symptoms appear.

What to Expect Before the Test

No special preparation is needed. You may have a small needle inserted to draw blood from your arm. The process usually takes a few minutes.

What to Expect After the Test

You can return to your normal activities immediately. There may be slight bruising or soreness at the injection site, but this usually fades quickly.

When You Might Need This Test

This test is commonly used for routine HIV screening, especially in high-risk groups, or after potential exposure (e.g., sexual contact, needle use, or blood exposure). It may also be recommended if you have symptoms like fever, fatigue, or unexplained weight loss.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Early detection of HIV is critical. This test helps identify infection quickly, allowing for prompt medical care, treatment, and support to manage the virus effectively and reduce its progression. Positive results require confirmation with additional testing.

Short name

HIV Antibody Screen (Qualitative)

Frequently asked questions

How soon can I get results?
Results are typically available within 1 to 3 business days, depending on lab processing times. Follow-up instructions will be provided by your healthcare provider.
What does a positive result mean?
A positive result means your blood test detected HIV antibodies or the p24 protein, indicating possible infection. You will need further testing (like a confirmatory HIV antibody test) to confirm the diagnosis. Your doctor will guide you on next steps.
Can I have false positives or false negatives?
While rare, false results can occur. False positives may happen if you have an infection unrelated to HIV or recent exposure. False negatives are less likely with this test but can happen if tested too early after exposure. Discuss your timeline with your healthcare provider.
  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