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- W2154248216 endingPage "952" @default.
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- W2154248216 abstract "The terms ‘false-positive’ and ‘false-negative’ are widely used in discussions of urine drug test (UDT) results. These terms are inadequate because they are used in different ways by physicians and laboratory professionals and they are too narrow to encompass the larger universe of potentially misleading, inappropriate and unexpected drug test results. This larger universe, while not solely comprised of technically ‘true’ or ‘false’ positive or negative test results, presents comparable interpretive challenges with corresponding clinical implications. In this review, we propose the terms ‘potentially inappropriate’ positive or negative test results in reference to UDT results that are ambiguous or unexpected and subject to misinterpretation. Causes of potentially inappropriate positive UDT results include in vivo metabolic conversions of a drug, exposure to nonillicit sources of a drug and laboratory error. Causes of potentially inappropriate negative UDT results include limited assay specificity, absence of drug in the urine, presence of drug in the urine, but below established assay cutoff, specimen manipulation and laboratory error. Clinical UDT interpretation is a complicated task requiring knowledge of recent prescription, over-the-counter and herbal drug administration, drug metabolism and analytical sensitivities and specificities." @default.
- W2154248216 created "2016-06-24" @default.
- W2154248216 creator A5033233100 @default.
- W2154248216 creator A5080939734 @default.
- W2154248216 creator A5089838786 @default.
- W2154248216 date "2009-08-01" @default.
- W2154248216 modified "2023-10-17" @default.
- W2154248216 title "‘False-positive’ and ‘false-negative’ test results in clinical urine drug testing" @default.
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- W2154248216 doi "https://doi.org/10.4155/bio.09.81" @default.
- W2154248216 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21083064" @default.
- W2154248216 hasPublicationYear "2009" @default.
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