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An assay that quantifies antigen or antibody by immunochemical means. The antigen can be a relatively simple substance such as a drug, or a complex one such as a protein or a virus. See Antibody, Antigen

The reactants are first mixed so that a varying quantity of one (A) is added to a constant amount of the other (B). The formation of an immune (antigen-antibody) complex is measured as a function of the varied reactant (A). The result is represented by a “standard curve” for reactant A. An unknown sample is tested by adding it to reactant B. The extent of the measured change is referred to the standard curve, and thereby is obtained the amount of reactant A which produces a comparable change. The amount is represented as the content of reactant A in the unknown sample. See Immunofluorescence, Immunology, Radioimmunoassay


A laboratory detection method that uses antibodies to react with specific substances.
References in periodicals archive ?
Some of the key market players of the European enzyme immunoassay (EIA) market include Hoffmann-La Roche Ltd (Switzerland), Abbott (U.
This is best illustrated by hydrocodone, which cross-reacts with the oxycodone immunoassay per the package insert and leads to 56% of the oxycodone false-positive results (from hydrocodone measured by LC-MS/MS).
For example reference may use LC-MS/MS and reference lab-2 may use an immunoassay method that does not detect 25-0H D2 completely.
As next steps in his research, Chou said he is conducting tests to compare the sensitivity of the D2PA-enhanced immunoassay to a conventional immunoassay in detecting breast and prostate cancers.
The number of laboratories reporting positive results for each drug and concentration challenged in the survey was examined, and the performance of each immunoassay technique was compared.
4] immunoassays aren't reliable in some patients with disturbances in binding proteins, Dr.
The final rule on the fee schedule does not immediately extend coverage to the immunoassay test, "but it opens the door for a national coverage decision that would extend coverage to this specific type of test," a CMS press officer told this newspaper.
Immunoassay Applications in Grain Products and Food Processing (Gina Clapper and Lulu Kurman).
Table 85: Chinese Historic Review for Immunoassay Systems by
Browse 352 market data tables and 40 figures spread through 305 pages and in-depth TOC on " Immunoassay Market "
Table 1 lists the nonparametric centiles of distribution and pooled within-assay CVs for each immunoassay, and the immunoassays are compared in Table 2.