Any of several methods for quantitative determination of chemical substances that use binding between an antigen and homologous antibodies. These include radio-immunoassay and enzyme immunoassay. See RADIO-IMMUNOASSAY; ENZYME IMMUNOASSAY.

Proof of antigenic substances in test tubes by means of antigen-antibodyreaction

Ligand-binding assay based on antibodies capable of specific binding to the pesticide analyte. Most commonly used in a competitive binding format where analyte molecules compete with a specific antigen complex labelled for detection using a radioisotope (radio immunoassay - RIA) or enzyme (enzyme-linked immunoassay - ELISA).

identification of a substance (especially a protein) by its action as an antigen; "PSA in the blood can be measured with an immunochemical assay"

a technique for detecting and measuring a target compound through use of an antibody that binds only to that substance

a test in which a substance is identified by its ability to produce an immune response (by binding to specific antibodies)

a test that uses antibodies to detect the presence of drugs and other substances in urine

a type of test that measures protein molecules, which interact with the pregnancy hormone in blood or urine

An analytical technique that uses antibody molecules as binding agents in the detection and quantification of substances in a sample. Often used to detect hazardous substances in low quantities or demonstrate compliance with governmental standards.

An assay (test) which detects antigens or antibodies.

A technique for identifying a substance by using antibodies specific to that substance to separate the substance or identify it with a marker.

A biochemical test that measures the level of bodily reaction to a foreign object that may be harmful to the body.

A laboratory technique that makes use of the binding between an antigen and its antibody in order to identify and quantify the specific antigen or antibody in a sample. Initial Test

Technique for identifying substances based on the use of antibodies.

Detection and assay of substances by serological (immunological) methods; in most applications the substance in question serves as antigen, both in antibody production and in measurement of antibody by the test substance.

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

The quantative determination of chemical substances that utilise the highly specific binding between antigens and antibodies

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 test that uses the binding of antibodies to antigens to identify and measure certain substances. Immunoassays may be used to diagnose disease. Also, test results can provide information about a disease that may help in planning treatment (for example, when estrogen receptors are measured in breast cancer).

A technique of identifying a substance based on its ability to act as an antigen.

A sensitive analytical procedure using a highly specific antigen-antibody reaction and principles such as fluorescence, radioactivity, or enzymatic activity to measure biochemical substances which are either the antigen or the antibody in that reaction.

the identification of a substance based on its capacity to act as an antigen.

An immunoassay is a biochemical test that measures the level of a substance in a biological liquid, typically serum or urine, using the reaction of an antibody or antibodies to its antigen. The assay takes advantage of the specific binding of an antibody to its antigen. Monoclonal antibodies are often used as they only usually bind to one site of a particular molecule, and therefore provide a more specific and accurate test, which is less easily confused by the presence of other molecules.