Dexamethasone suppression test (low dose, overnight)
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Dexamethasone suppression test (low dose, overnight), serum or plasma
8:00 AM serum cortisol level: <5 mcg/dL
SST, PPT, green
Give 1 mg dexamethasone at 11:00 PM. At 8:00 AM, draw serum/plasma cortisol level.