radioimmunoassay

[ rey-dee-oh-im-yuh-noh-as-ey, -a-sey, -i-myoo- ]

noun

1. a test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as a protein, hormone, or drug, in a given sample of body fluid or tissue.

radioimmunoassay

/ ˈreɪdɪəʊˌɪmjʊnəʊˈæseɪ /

noun

1. a sensitive immunological assay, making use of antibodies and radioactive labelling, for the detection and quantification of biologically important substances, such as hormone concentrations in the blood

radioimmunoassay

/ rā′dē-ō-ĭm′yə-nō-ăs′ā,-ĭm-yo̅o̅′- /

1. An immunoassay in which the substance to be identified or quantified is labelled with a radioactive substance (called a tracer ), such as an ion.
2. See also immunoassay

Word History and Origins

Origin of radioimmunoassay¹

First recorded in 1960–65; radio- + immunoassay