Dexamethasone suppression test (high dose, overnight)

Dexamethasone suppression test (high dose, overnight) is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

Dexamethasone suppression test (high-dose, overnight), serum or plasma

8:00 AM serum cortisol level: <5 mcg/dL

[<140 nmol/L]

SST, PPT, green

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Give 8 mg dexamethasone dose at 11:00 PM. At 8:00 AM, draw cortisol level.

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