radioimmunoassay /ra·dio·im·mu·no·as·say/ (-im″u-no-as´a) a highly sensitive and specific assay method that uses the competition between radiolabeled and unlabeled substances in an antigen-antibody reaction to determine the concentration of the unlabeled substance, which may be an antibody or a substance against which specific antibodies can be produced.
radioimmunoassay (RIA)
radioimmunoassay
ra·di·o·im·mu·no·as·say (r  d - - my -n- s , --my -)n. Abbr. RIA The immunoassay of a substance, such as a hormone or an enzyme that has been radiolabeled. |
radioimmunoassay (RIA)
[rā′dē·ō·im′yənō·as′ā]
Etymology: L, radius + immunis, free; Fr, essayer, to try
a technique in radiology used to determine the concentration of an antigen, antibody, or other protein in the serum. The technique involves the injection of a known amount of a radioactively labeled substance that reacts with the protein in question.
radioimmunoassay
a sensitive assay method used for the measurement of minute quantities of specific antibodies or any antigen, such as hormones or drugs, against which specific antibodies can be raised; abbreviated RIA. An assay for a specific hormone uses antihormone antibody produced by injecting the human hormone into an animal, such as a rabbit. In the assay either the antigen or antibody is labeled with radioisotope.
radioimmunoassay
see RIA
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