The enzyme-linked immunosorbent assay (ELISA) also known as EIA is a test which is done to detect and measure antibodies in your blood to identify a harmful substance. It is used to determine the antibodies which are related to certain infections condition. Antibodies are the proteins that your body generates in the response to harmful substances known as the antigens. ELISA is also known as wet-lab type analytic biochemistry assay. This has been used as a diagnostic tool before more in-depth tests are ordered. If you have symptoms of HIV, Lyme disease, pernicious anaemia, rotavirus, syphilis, etc., then you're advised to take ELISA test. This test is also performed in the food industry in order to detect potential food allergens, such as milk, peanuts, almonds and eggs, etc.