Assay

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Assay

Metal purity test to confirm that the metal meets the standards for trading on a commodities exchange (commodities exchange center).

Assay

To test precious metals for their purity. This is important to commodities and futures involving precious metals, in which the quality of the underlying metals must be specified in the contract.

assay

A test to determine the purity of gold, silver, or other precious metals. Metals used for delivery of futures contracts must be assayed to verify that they meet standards established by the exchange on which the contracts trade.
References in periodicals archive ?
Then, during the past 10 years, the newest technology employing chemiluminescence detection (CLIA) brought more sensitive TSH assays that accurately detect concentrations as low as 0.
also discuss the ability of heterophilic antibodies to interfere in thyroid hormone and TSH assays.
The National Academy of Clinical Biochemistry has recommended that the functional sensitivity of TSH assays be [less than or equal to]0.
In conclusion, interference from heterophilic antibodies in TSH assays has become exceptional but still exists (14-16).
Free hormone levels are less reliable measures of thyroid function than are TSH assays because they are more susceptible to factors that can adversely affect test accuracy.
who also saw false increases using the Beckman Coulter hCG, TnI, CK-MB and TSH assays on the Unicel DxI, found reductions in erroneous increases using rapid serum tubes (RSTs) compared to PSTs (1).
Even with "third generation" immunometric TSH assays, it is important to correlate findings with clinical evaluation of the patient.
But really good TSH assays were not available until about 10 years ago, so some patients were overtreated and therefore are at risk for significant bone loss.
TSH complexes with IgG may be very rare or may go unidentified because of low reactivity in TSH assays.
In this study, we aimed at defining the feasibility of harmonizing TSH assays by use of new calibrators independent of the current IRPs.
The Whickham survey, performed in the northeastern part of England at a time when no sensitive TSH assays were available, found thyrotoxicosis in 1.