Radioimmunoassay (RIA) is a competitive assay technique that consumes less of the reagent, an antibody (Ab), than the analyte antigen (Ag). Ag∗, also referred to as the tracer, is an antigen that has been radioactively labeled and is necessary for performing radioactive affinity labeling (RIA). The radioimmuno test is a highly accurate way to measure the amount of an antigen in a sample....
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