Cortisol, serum or plasma

Cortisol, serum or plasma is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

Cortisol, plasma or serum

8:00 AM: 5–20 mcg/dL

[140–550 nmol/L]

(time-dependent)

8 hrs post 1 mg dexamethasone given at midnight: 0–5 mcg/dL;

30–60 min post 25 units Cosyntropin [intravenously: >20 mcg/dL]

SST, PPT (light green)

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