HIV Antibody Screening Test (Plasma/Serum)

This test is done to find out whether HIV, the virus that attacks the immune system, is present in your body. Early detection allows you to start treatment sooner, protect your long-term health, and lower the chance of passing the virus to others.

Your healthcare provider may recommend this test if you have risk factors for HIV, such as unprotected sex, shared needles, or other behaviors that increase exposure. It may also be part of routine screening for certain groups (e.g., sexually active adults, pregnant individuals, or those with sexually transmitted infections).

Before the test, your healthcare provider will explain the procedure and answer your questions. You usually do not need to fast or make any special preparations. A small blood sample will be taken from a vein in your arm or from a finger stick, so wear clothing that makes your arm easy to reach, and tell your provider about any medicines you take.

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm. The test uses plasma or serum from your blood. Results are typically available within days to weeks, depending on lab processing times.

This test measures markers of HIV infection, including antibodies that your immune system produces in response to the virus and, in some versions of the test, pieces of the virus itself called antigens. Finding these markers shows whether HIV is present in your blood.

The test detects HIV antibodies (specifically HIV-2 antibodies in this case) using an immunoassay method. Antibodies are proteins your immune system produces to fight the virus. If present, they indicate past or current infection.

Results are reported as reactive (positive) or nonreactive (negative). A reactive result means signs of HIV were detected and must always be confirmed with a second, follow-up test before a diagnosis is made. A nonreactive result means no signs of HIV were found, although your provider may recommend repeating the test if it was done soon after a possible exposure, before the virus could be detected.

A positive result means your blood contains HIV antibodies, suggesting you may have been infected. A negative result means no detectable antibodies were found at the time of testing. Follow-up testing (e.g., confirmatory assays) may be needed for positive results.