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Journal of Clinical Endocrinology & Metabolism, Vol 74, 698-700, Copyright © 1992 by Endocrine Society

ARTICLES

Utility of an oral diffusion sink (ODS) device for quantification of saliva corticosteroids in human subjects

JE Shipley, NE Alessi, SE Wade, AD Haegele and B Helmbold
Department of Psychiatry, University of Michigan, Ann Arbor 48109-0840.

Measurement of cortisol by assay of single blood or saliva samples is inherently imprecise due to the episodic secretion of cortisol. In addition, assay of blood usually quantifies total cortisol, rather than separating free hormone, which is proportionately the much smaller fraction. Furthermore, the free fraction may be disproportionately higher in hypercortisolism. Urinary free cortisol is one measure that provides both a time integral and a focus on the free fraction, but it is inconvenient and prone to collection error in unsupervised ambulatory subjects. The Oral Diffusion Sink (ODS) apparatus takes up corticosteroids from saliva according to first-order kinetics and may provide a practical alternative. We assessed the utility of the ODS in a study of seven healthy volunteers admitted to the CRC for three days. Data on day two from 0700-1100 h and 1100-1500 h were compared between the ODS and three other means of assessing cortisol: urinary free cortisol (UFC), blood, and saliva. The subjects all tolerated wearing the ODS device without any complaint. High correlations were observed between ODS values vs. data for UFC, plasma, and saliva determinations. In summary, the ODS device was well tolerated and collected reliable corticosteroid data, and thus provides a new, non-invasive methodology for studies of HPA function in health and disease.


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