Definition of "radioimmunoassay" [radioimmunoassay]

• 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "She and a younger colleague, Solomon Berson, developed methods for the radioimmunoassay -- an analytic tool that allows investigators to survey minute quantities of hormones, viruses, and chemicals in human beings."
• "Rosalyn Yalow (1921 -), "medical physicist" who "won a Nobel prize for her work developing the radioimmunoassay technique""
• "These initial experiments led to the discovery of radioimmunoassay (RIA), an ingenious application of nuclear physics in clinical medicine."