HIV p24 Antigen Quantitative, Serum/Plasma

What Is the Purpose of This Test?

HIV p24 antigen testing is primarily used to detect HIV infection early and assess how the virus is responding to treatment. While not as sensitive as HIV antibody tests, it can provide additional information when used alongside other tests, especially in early or advanced stages of infection.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then sent to a lab for analysis using a sensitive immunoassay method to detect the presence of p24 protein.

What Does a Positive Result Mean?

A positive result indicates the presence of HIV p24 antigen, meaning the virus is actively producing this protein. This can happen during early infection or in later stages if the virus is replicating. It does not replace antibody tests but complements them for comprehensive monitoring.

How Does This Test Differ from Other HIV Tests?

Unlike HIV antibody tests (e.g., ELISA or rapid tests), which detect antibodies your immune system produces against HIV, this test measures the virus itself by detecting p24 protein. It can sometimes detect HIV earlier than antibody tests but is less commonly used for initial diagnosis.