HIV test: A test for the human immunodeficiency virus, the cause of AIDS . HIV tests are designed to detect antibodies to the HIV virus or the HIV virus itself. The antibody tests are:

• ELISA ( enzyme-linked immunosorbent assay ) -- a screening test used to detect infection with HIV. If positive, the ELISA test is usually repeated.
• Western blot -- a test usually used to confirm the results of an ELISA. It can rule out a false-positive by distinguishing HIV antibodies from other antibodies that may react to the ELISA.
• IFA (indirect fluorescent antibody) -- a test used like the less expensive Western blot to confirm the results of an ELISA.

The premiere test that can identifies the genetic material, the RNA , of the HIV virus is called PCR (the polymerase chain reaction ). PCR can detect an early HIV infection before antibodies are evident and determine whether a baby born to an HIV-positive mother will have HIV. A test similar to PCR testing, called the branched DNA test, also detects the RNA of HIV.

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