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Western BlotAudio (En español)

A type of antibody test used to confirm a positive result on an HIV screening test. (The initial screening test is usually an enzyme-linked immunosorbent assay [ELISA] or, less often, a viral load test). The immune system responds to HIV infection by producing HIV antibodies. A Western blot can detect HIV antibodies in the blood, oral fluid, or urine.

See Related Term(s):  Antibody, Enzyme-Linked Immunosorbent Assay, Viral Load Test