A test used to measure the levels of radioactively-tagged hormones in the plasma of the blood is called Radioimmunoassay (RIA). This assay uses a competitive binding reaction.
Radioimmunoassay (RIA) is a competitive binding assay that involves antibody-antigen binding and radioactive antigen.
In this assay (RIA), a specific antigenic labeled particle competes for binding to a given antibody or for the binding sites in a cell receptor to form immune complexes.
In consequence, RIA in vitro assay can be used to measure the presence of a given antigen that shows high sensitivity.
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