![]() ![]() For additional information visit Linking to and Using Content from MedlinePlus. Any duplication or distribution of the information contained herein is strictly prohibited without authorization. Links to other sites are provided for information only - they do not constitute endorsements of those other sites. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. The Western blot test separates the blood proteins and detects the specific proteins (called HIV antibodies) that indicate an HIV infection. During the test, a small sample of blood is taken and it is used to detect HIV antibodies, not the HIV virus itself. The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A Western blot test is typically used to confirm a positive HIV diagnosis. This site complies with the HONcode standard for trustworthy health information: verify here. Learn more about A.D.A.M.'s editorial policy editorial process and privacy policy. is among the first to achieve this important distinction for online health information and services. follows rigorous standards of quality and accountability. is accredited by URAC, for Health Content Provider (URAC's accreditation program is an independent audit to verify that A.D.A.M. Tell the difference between the 2 types of virus, HIV-1 and HIV-2Ī.D.A.M., Inc.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.Western blot misclassifies as HIV-1 >60 of HIV-2 infections. A blood test is the most accurate because blood has a higher level of antibodies than other body fluids. This presentation will also refer to individual HIV tests by brand. 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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