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Cortisol Determination and the Dexamethasone Suppression TestA Review
Herbert Y. Meltzer, MD;
Victor S. Fang, PhD
Arch Gen Psychiatry. 1983;40(5):501-505.
Abstract
• The possibility that unreliability of plasma cortisol level determinations might interfere with the use of the dexamethasone suppression test (DST) in clinical practice was evaluated by examining published data on the reliability of plasma cortisol determinations as well as a comparison of two radioimmunoassay (RIA) methods with a competitive protein binding assay (CPBA). Significant discrepancies between various methods of plasma cortisol level determinations have been reported in most, but not all, studies. The most widely used method, RIA kits, may not produce levels comparable with those produced by the CPBA, used in a recent effort to standardize the DST for use in psychiatry. The use of the DST by physicians should be preceded by an assessment of the validity of the cortisol level determinations in the critical range for the DST by the laboratory they use.
Author Affiliations
From the Departments of Psychiatry (Drs Meltzer and Fang) and Medicine (Dr Fang), University of Chicago Pritzker School of Medicine, and the Illinois State Psychiatric Institute, Chicago (Dr Meltzer).
Footnotes
Accepted for publication Dec 2, 1982.
Reprint requests to Department of Psychiatry, University of Chicago Pritzker School of Medicine, 950 E 59th St, Chicago, IL 60637 (Dr Meltzer).
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