Canadian Medical Guide > Analytical, Diagnostic and Therapeutic Techniques and Equipment > Diagnosis > Diagnostic Techniques and Procedures > Diagnostic Techniques, Radioisotope > Radioimmunoassay Terms and Definitions

Radioimmunoassay

Medical Definition:	Classic quantitative assay for detection of antigen-antibody reactions using a radioactively labeled substance (radioligand) either directly or indirectly to measure the binding of the unlabeled substance to a specific antibody or other receptor system. Non-immunogenic substances (e.g., haptens) can be measured if coupled to larger carrier proteins (e.g., bovine gamma-globulin or human serum albumin) capable of inducing antibody formation.
Guide Notes:	NIM; coord with substance /anal or body fluid qualif but not /immunol; do not confuse with IMMUNORADIOMETRIC ASSAY
Previously Indexed:	Immunoassay (1966-1967)

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