p24 Antigen

Also known as: p24 capsid or core antigen; p24 antigen capture assay

Formal name: p24 antigen

Related tests: HIV antibody; HIV viral load; CD4 and CD8; HIV genotypic resistance testing; HIV phenotypic resistance testing

At a Glance

Why Get Tested?

To check for infection with HIV after a recent exposure

When to Get Tested?

If you have been recently exposed to HIV

Sample Required?

A blood sample drawn from a vein in your arm or by a fingerstick

Test Preparation Needed?

None

This article was last reviewed on March 15, 2009. | This page was last modified on November 6, 2009.

The review date indicates when the article was last reviewed from beginning to end to ensure that it reflects the most current science. A review may not require any modifications to the article, so the two dates may not always agree.

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