HIV – P24

The HIV – P24 Test is a diagnostic blood test that detects the p24 antigen, a protein that is part of the Human Immunodeficiency Virus (HIV). This antigen appears in the blood during the early stages of HIV infection, often before antibodies are produced.

Because of its ability to detect infection earlier than standard antibody tests, the p24 test is useful for early diagnosis, especially after recent exposure.

The purpose of this test is to:

• Detect the p24 antigen of HIV in the blood
• Enable early diagnosis of HIV infection
• Identify infection before antibodies are detectable
• Assist in timely treatment and prevention of transmission

HIV – P24 Test

The HIV – p24 Antigen test detects the p24 antigen, a protein that forms part of the HIV virus. The p24 antigen can become detectable relatively early after HIV infection, making it useful for identifying early HIV infection.

The test may be used when recent HIV exposure is suspected or when early infection needs to be evaluated. In modern laboratory testing, p24 antigen is commonly included in fourth-generation HIV antigen/antibody tests, which detect both HIV p24 antigen and antibodies to HIV-1/HIV-2.

A negative result does not always rule out very recent infection because there is a window period between infection and detectability. Your healthcare provider may recommend repeat or additional testing depending on the timing of possible exposure.

Test Recommended for Individuals:

• Individuals with a recent or suspected HIV exposure
• People being evaluated for possible early HIV infection
• Individuals with symptoms that may be associated with acute HIV infection
• People undergoing HIV screening as recommended by their healthcare provider
• Individuals requiring evaluation during the HIV testing window period
• Patients advised to undergo additional testing after a possible exposure

FAQs

1. What is the HIV p24 antigen?
The p24 antigen is a protein found in HIV. It can become detectable in the blood relatively early after infection, before HIV antibodies may be detectable.

2. Can the HIV p24 test detect HIV immediately after exposure?
No. There is a window period during which HIV infection may not yet be detectable. The timing of testing matters, and your healthcare provider may recommend repeat testing depending on when the exposure occurred.

3. Is the p24 antigen included in a fourth-generation HIV test?
Yes. Fourth-generation laboratory HIV tests typically detect both HIV p24 antigen and antibodies to HIV-1 and HIV-2, allowing earlier detection than antibody-only testing.