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|Noun||1.||immunochemical assay - identification of a substance (especially a protein) by its action as an antigen; "PSA in the blood can be measured with an immunochemical assay"|
bioassay, bio-assay - appraisal of the biological activity of a substance by testing its effect on an organism and comparing the result with some agreed standard
radioimmunoassay - immunoassay of a substance that has been radioactively labeled