Immunoassays are techniques that use antibodies to detect and quantify specific antigens. The Enzyme-Linked Immunosorbent Assay (ELISA) is a widely used method that involves binding an antigen to a solid surface and detecting it with an enzyme-linked antibody. Radioimmunoassay (RIA) uses radioactive isotopes for detection. Immunoassays are highly sensitive and specific, making them ideal for clinical diagnostics, drug testing, and biomarker discovery.
