Laboratory Procedure
radioimmunoassay Audio
ra·di·o·im·mu·no·as·say [ rey-dee-oh-im-yuh-noh-as-ey, -a-sey, -i-myoo- ]
Subclass of:
Diagnostic Techniques, Radioisotope; Immunoassay method
Definitions related to radioimmunoassay:
  • Classic quantitative assay for detection of antigen-antibody reactions using a radioactively labeled substance (radioligand) either directly or indirectly to measure the binding of the unlabeled substance to a specific antibody or other receptor system. Non-immunogenic substances (e.g., haptens) can be measured if coupled to larger carrier proteins (e.g., bovine gamma-globulin or human serum albumin) capable of inducing antibody formation.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2021
  • Immunoassay, Radioimmunoassay
    NCI Health Level 7 Vocabulary
    U.S. National Cancer Institute, 2018
  • Quantitative chemical test based on displacement of radioligand from antigen-antibody complex; usually the radioligand and unknown are antigens; antibody specificity permits use of crude samples and antisera.
    CRISP Thesaurus
    National Institutes of Health, 2006
  • Radioimmunoassay (RIA) is an immunological technique, which quantitatively determines antigen and antibody concentrations, using a radioactively labeled substance (radioligand), either directly or indirectly.
    NCI Thesaurus
    U.S. National Cancer Institute, 2021
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