Overnight Dexamethasone Suppression Test

ACTH Suppression Test, Cortisol Suppression Test, Dexamethasone Suppression Test (DST), DST (Dexamethasone Suppression Test)

Why It Is Done

An overnight dexamethasone suppression test is done to check for a condition in which large amounts of cortisol are produced by the adrenal glands (Cushing's syndrome).

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Author:	Sydney Youngerman-Cole, RN, BSN, RNC	Last Updated: August 3, 2006
Medical Review:	Caroline S. Rhoads, MD - Internal Medicine David C.W. Lau, MD, PhD, FRCPC - Endocrinology & Metabolism
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