![]() Detect antibodies more accurately than screening tests.It is usually done when the screening test is positive. This test can detect the virus as early as 3 weeks after getting infected.Ī follow-up test is also called a confirmatory test. This test is usually not used by itself to screen for HIV infection.Īn antibody-antigen blood test checks for levels of both HIV antibodies and the p24 antigen. The p24 antigen test is accurate 11 days to 1 month after getting infected. When you're first infected with HIV, and before your body has a chance to make antibodies to the virus, your blood has a high level of p24. This test is also less accurate than the blood test.Īn antigen test checks your blood for an HIV antigen, called p24. Urine - This test checks for antibodies in the urine.This test is less accurate than the blood test. It is done by swabbing the gums and inside cheeks. Oral fluid - This test checks for antibodies in the cells of the mouth.A blood test is the most accurate because blood has a higher level of antibodies than other body fluids. Blood - This test is done by drawing blood from a vein, or by a finger prick. ![]() These tests can detect antibodies starting a few weeks after you're infected with the virus. Or, you may have it done at a testing center or use a home kit. Your health care provider may order the test for you to have done at a lab. The most common tests are described below.Īn antibody test (also called immunoassay) checks for antibodies to the HIV virus. These are tests that check if you've been infected with HIV.
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