RIA

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radioimmunoassay

 (RIA) [ra″de-o-im″u-no-as´a]
a sensitive assay method that can be used for the measurement of minute quantities of specific antibodies or any antigen, such as a hormone or drug, against which specific antibodies can be raised. An assay for a specific hormone uses antihormone antibody produced by injecting the human hormone into an animal, such as a rabbit, and hormone that has been labeled with a radioisotope. These are mixed with the assay specimen and the antigen (hormone) bound to antibody is separated from the unbound antigen by chromatography or other means. Because any hormone in the assay specimen competes with the radiolabeled hormone for antibody binding sites, the amount of hormone in the specimen is inversely proportional to the radioactivity of the bound fraction or directly proportional to the activity of the free fraction. This is the standard method for clinical laboratory measurements of hormones and is also used for therapeutic drug monitoring, drug abuse screening, and other laboratory tests.

RIA

Abbreviation for radioimmunoassay.

RIA

abbr.
radioimmunoassay

RIA

abbreviation for radioimmunoassay.

RIA

Abbreviation for radioimmunoassay.

RIA

radioimmunoassay.
References in periodicals archive ?
Working in partnership with The Black Hole, the new RIAS creatives celebrate that no two customers are the same and that everyone should be treated as an individual, shunning stereotypes of over 50s.
Sarah Howe, Marketing Director at RIAS comments: "Our ITV3 sponsorship is a fantastic opportunity to further build our brand.
RIAS previously filed a complaint on June 29 with Egyptian prosecutors against GASC and Egyptian Traders for delaying the release of the vessel.
Commenting on the new initiative, Janet Connor, managing director of RIAS said: "RIAS is a top 2 Home Insurance Provider to the over 50s in the UK and Personal Lines Broker of the Year.