ELISA, Enzyme linked immunosorbent assay, is a test which detects and measures antibodies in the blood . It is helpful in detecting a particular antibody which is for a particular infectious disease. So in this way, by this test we can diagnose a particular disease in the body.

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An enzyme-linked immunosorbent assay, also called ELISA or EIA, is a test that detects and measures antibodies in your blood. ... Antibodies are proteins that your body produces in response to harmful substances called antigens. An ELISA test may be used to diagnose: HIV, which causes AIDS. Lyme disease