radioimmunoassay[-im′yo̵o nō as′ā, -a sā′]
the technique of immunoassay in which radioactive tracers are introduced into the substance to be analyzed
A procedure that measures minute amounts of a substance, such as a hormone or drug, by quantitating the binding, or the inhibition of binding, of a radiolabeled substance to an antibody.
(plural radioimmunoassays) (abbreviated as RIA)
(third-person singular simple present radioimmunoassays, present participle radioimmunoassaying, simple past and past participle radioimmunoassayed)
- To assay by this process.