A test used to detect HIV antibodies in a blood sample

(EIA), is the general term for an expanding technical arsenal of testing which allows a full range of quantitative analyses for both antigen and antibodies. These tests use color-changed products of enzyme-substrate interaction (or inhibition) to measure the antigen-antibody reaction. Examples of EIA procedures (EMIT, ELISA, MAC, MEIA) follow.

A test that provides information on the presence or amount of antibodies in the bloodstream. This test is sometimes referred to as an ‘ELISA.'