Definition of immunoassay in English English dictionary
A test for the presence of a substance using the reaction of an antibody to its antigen, making use of the high selectivity of components of biological immune systems
A test using antibodies to identify and quantify substances Often the antibody is linked to a marker such as a fluorescent molecule, a radioactive molecule, or an enzyme
A procedure used to identify substances, such as drugs of abuse, in urine, based on the competition between tagged and untagged antigens to combine with antibodies The uncombined, tagged antigen is an indicator of the drug present in the urine specimen
An antibody based testing method used for initial screening of specimens Positives on this test require confirmation by GC/MS for forensic/employment purposes
test which identifies antibody in patient based on use of a known antigen, or identifies the antigen based on the use of a known antibody
An immunoassay is a ligand binding assay which uses an antibody and the antibody's corresponding antigen as the binder and ligand The term immunoassay is often expanded to include any procedure in which the quantitation of an analyte depends on the progressive saturation of a specific binder or ligand, either of which may be the analyte, and the subsequent determination of the analyte's distribution between the bound and free fractions This includes competitive protein binding assays, where the binder is a naturally occurring binding protein, and receptor assays, where the binder is a naturally occurring cell receptor