RIA

(redirected from RIAS)
Also found in: Dictionary, Acronyms, Encyclopedia, Wikipedia.

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.
References in periodicals archive ?
The single most frequent request we received from users of the RIAS was to add a measure processing speed, but to add one in the context of the RIAS model, which to us meant having both verbal and nonverbal measures of processing speed and taking as much motor-dependence as possible from the tasks so as to reduce confounding with fine motor and related motor issues when measuring mental functions.
The RIA Interpretation specifically applies that standard to rollover recommendations for both Employee Retirement Income Security Act (ERISA) and non-ERISA retirement plans.
Anticipated fiduciary regulations from the Labor Department set off a "roller coaster" of breakaway advisor activity last year, and the anticipated legal implications of high-profile exits from the Protocol for Broker Recruiting could impact M&A this year, according to the latest Nuveen/DeVoe RIA Deal Book.
Looking ahead, "you're going to see aggregation" in the RIA space, Weissbluth asserted.
Further, RIAs can bridge the digital divide by offering new options to individuals who otherwise have limited access to telecommunications services and little knowledge about more complex computers.
Its economists have been evaluating the quality of agency RIAs for more than 35 years.
The RIA needs to, among other things, document the basis for the determination that the advice was in the client's best interest.
We believe this evidence, based on an expansive dataset of bilateral FD1 flows across several RIAs, adds to our understanding of the dynamics of regional integration in the FDI decision, as well as providing complementary insights into the regionalization vs.
RIAS's Vanhonacker said this "will not affect the case".
An unexpected outcome of 151A may include a shotgun marriage between RIAs and B-Ds so RIAs can continue to recommend FIAs.
Danish plastic products distributor RIAS A/S (OMX Copenhagen: RIAS B) announced on Friday (29 August) that it has adjusted down its profit expectations for the full year.