dexamethasone suppression test

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dex·a·meth·a·sone sup·pres·sion test

a test for the detection and diagnosis of Cushing syndrome; following administration of 1.0 mg of dexamethasone at 11 p.m., normal people suppress plasma cortisol to low levels; patients with Cushing syndrome do not. Higher dose regimens distinguish between Cushing syndrome due to tumor and due to hyperplasia.
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dexamethasone suppression test

Endocrinology A clinical test that measures the ability of dexamethasone to suppress ACTH and cortisol secretion by the adrenal gland. See Cushing's disease.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.