[rey-dee-oh-im-yuh-noh-as-ey, -a-sey, -i-myoo-] /ˌreɪ di oʊˌɪm yə noʊˈæs eɪ, -æˈseɪ, -ɪˌmyu-/

a test procedure that integrates immunologic and radiolabeling techniques to measure minute quantities of a substance, as a protein, hormone, or drug, in a given sample of body fluid or tissue.
a sensitive immunological assay, making use of antibodies and radioactive labelling, for the detection and quantification of biologically important substances, such as hormone concentrations in the blood

radioimmunoassay ra·di·o·im·mu·no·as·say (rā’dē-ō-ĭm’yə-nō-ās’ā, -ĭ-myōō’-)
Abbr. RIA
The immunoassay of a substance, such as a hormone or an enzyme that has been radiolabeled.
(rā’dē-ō-ĭm’yə-nō-ās’ā, -ĭm-y’-)
An immunoassay in which the substance to be identified or quantified is labelled with a radioactive substance (called a tracer), such as an ion. See also immunoassay, tracer.


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  • Radioimmunodiffusion

    radioimmunodiffusion ra·di·o·im·mu·no·dif·fu·sion (rā’dē-ō-ĭm’yə-nō-dĭ-fyōō’zhən, -ĭ-myōō’-) n. A method for the study of antigen-antibody reactions by gel diffusion using a radioisotope-labeled antigen or antibody.

  • Radioimmunoelectrophoresis

    radioimmunoelectrophoresis ra·di·o·im·mu·no·e·lec·tro·pho·re·sis (rā’dē-ō-ĭm’yə-nō-ĭ-lěk’trə-fə-rē’sĭs, -ĭ-myōō’-) n. Immunoelectrophoresis in which the antigen or antibody is labeled with a radioisotope.

  • Radioimmunoprecipitation

    radioimmunoprecipitation ra·di·o·im·mu·no·pre·cip·i·ta·tion (rā’dē-ō-ĭm’yə-nō-prĭ-sĭp’ĭ-tā’shən, -ĭ-myōō’-) n. Immunoprecipitation that uses a radioisotope-labeled antibody or an antigen.

  • Radioimmunology

    [rey-dee-oh-im-yuh-nol-uh-jee] /ˌreɪ di oʊˌɪm yəˈnɒl ə dʒi/ noun 1. the study of biological substances or processes with the aid of antigens or antibodies labeled with a radioactive isotope. radioimmunology ra·di·o·im·mu·nol·o·gy (rā’dē-ō-ĭm’yə-nŏl’ə-jē) n. The study of immunity by radiolabeling and other radiological methods. ra’di·o·im’mu·no·log’i·cal (-nə-lŏj’ĭ-kəl) adj.

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