radioimmunoassay

[ rey-dee-oh-im-yuh-noh-as-ey, -a-sey, -i-myoo- ]
/ ˌreɪ di oʊˌɪm yə noʊˈæs eɪ, -æˈseɪ, -ɪˌmyu- /

noun

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.

Origin of radioimmunoassay

First recorded in 1960–65; radio- + immunoassay

Words nearby radioimmunoassay

radiogoniometer, radiogram, radiograph, radiography, radioimmunity, radioimmunoassay, radioimmunodiffusion, radioimmunoelectrophoresis, radioimmunology, radioimmunoprecipitation, radioiodine

British Dictionary definitions for radioimmunoassay

radioimmunoassay
/ (ˈreɪdɪəʊˌɪmjʊnəʊˈæseɪ) /

noun

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

Medical definitions for radioimmunoassay

radioimmunoassay
[ rā′dē-ō-ĭm′yə-nō-ăs′ā, -ĭ-myōō′- ]

n.

The immunoassay of a substance, such as a hormone or an enzyme that has been radiolabeled.

Scientific definitions for radioimmunoassay

radioimmunoassay
[ rā′dē-ō-ĭm′yə-nō-ăs′ā, -ĭm-yōō′- ]

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