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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 ?
Director, Communications, Spry Hive Industries LLC.
Spry says that Al-jon has shipped several units both to large companies feeding their own super-sized shredders or to smaller recyclers preparing material to go to these plants.
During the four-week trial the jury at Bristol Crown Court heard harrowing evidence of how Spry subjected the children to a regime of abuse.
Judge Simon Darwall-Smith told Spry that this was the worst case he had come across in 40 years in law.
Dafoe, Spry obtained a job as a reporter with the Manitoba Free Press.
The Toronto-born, England-educated Spry, who moved to Montreal to join the National Film Board of Canada in 1964, directed a number of groundbreaking films in the 1970s, including the controversial NFB documentary feature "Action: The October Crisis of 1970.
Constance Spry is indeed a name, or an icon, or perhaps more accurately a brand, that evokes specific associations--there is the celebrated 1950s cookbook (viewed as a kind of updated Mrs Beeton), flower arranging at the Women's Institute, a Mayfair flower shop and correspondence courses in everything from etiquette to party-hosting.
So what do Spry and Jones regard as some of the major legal issues facing SMEs in 2004.
City were first attracted to Chippo after former Highfield Road fitness coach Roger Spry alerted the club to his talents.
And when you ask Chicago school officials about the success of their dramatic decentralizing plan--one the Tribune called the most radical assault on the administrative power structure in American educational history --you invariably hear the story of Spry Elementary.
The article goes on to say that Agilent is the market leader in gas chromatography and GC/MS systems and a co-leader in HPLC systems, concluding that Agilent's bio-analytical measurement business, after years of being considered a bit conservative and slow moving, is today "aggressive -- even audacious -- and surprisingly spry.
Xlear is also the maker of the Spry brand of products.