immunoradiometric assay


im·mu·no·ra·di·o·met·ric as·say

an assay that differs from conventional radioimmunoassay in that the compound to be measured combines directly with radioactively labeled antibodies.

immunoradiometric assay

Abbreviation: IRMA
Radioassay in which an antibody is labeled with a radioactive tracer. Antigens are detected when they bind, reversibly, to the antibody. See also: assay