EIA (Enzyme Immunoassay)

Enzyme Immunoassay (EIA) is a laboratory method used to detect and measure specific substances, such as drugs, hormones, or proteins, in a sample like blood or urine. It works by using antibodies that bind specifically to the target substance. These antibodies are linked to enzymes which, when they interact with a special chemical, produce a measurable signal, often a color change. The intensity of this signal correlates with the amount of the substance in the sample, allowing precise quantification. EIA is widely used for its sensitivity, specificity, and ability to process many samples efficiently.