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radioimmunoassay

(-im′yo̵o nō asā, -a sā)

noun

the technique of immunoassay in which radioactive tracers are introduced into the substance to be analyzed

See radioimmunoassay in American Heritage Dictionary 4

noun Abbr. RIA
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.

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