?:definition
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Photometric immunoassay analyzers that use the catalytic properties of enzymes to detect and/or quantitate immunological reactions. An enzyme substrate is attached as a label to either an antigen or an antibody, and then the changes in concentration of the ligand (the substance being analyzed) are measured using the result of the antigen-antibody reaction. Enzyme immunoassay analyzers are clinically used in the analysis of drugs and endogenous substances in body fluids (e.g., plasma, cerebrospinal fluid, urine).
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