HIV Antibody Screening and Confirmatory Test (Serum/Plasma)

Why This Test Is Done

HIV antibody testing is typically performed to identify exposure to HIV, especially in individuals at higher risk (e.g., sexually active adults, people with multiple sexual partners, or those with sexually transmitted infections). It may also be used as part of routine screening in certain settings, such as healthcare visits or pre-exposure prophylaxis (PrEP) evaluations. Some tests are done to confirm a positive screening result or to monitor HIV status over time.

How the Test Works

The test uses an immunoassay method to detect HIV antibodies in your blood or plasma. When you are infected with HIV, your immune system produces antibodies against the virus. These antibodies can be detected in your blood within weeks to months after exposure, depending on the timing of exposure. The test looks for these antibodies to confirm infection.

Sample Collection and Preparation

A blood sample is drawn from a vein in your arm. The blood is then processed to separate the serum or plasma, which is tested for HIV antibodies. This process is quick and generally well-tolerated, though you may experience a slight pinch or discomfort during the draw.

Test Results and Interpretation

Results are reported as either positive or negative. A positive result indicates the presence of HIV antibodies and requires further evaluation (such as a confirmatory test) to confirm infection. A negative result means no detectable antibodies were found at the time of testing, but this does not guarantee you are not infected. Follow-up testing may be recommended if you suspect exposure.