| immunoradiometric assay |
Immunoradiometric assays (IRMA) are immunometric assays in which one binder (or ligand) is used to capture the analyte and a second binder, tagged with a radioisotope, then binds to the analyte. This forms a sandwich complex of binder-analyte-conjugate or ligand-analyte-conjugate which is then measured. The standard curve of an IRMA assay has a positive slope and is often asymmetrical.
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