CORTISOL SUPPRESSION BY DEXAMETHASONE, OVERNIGHT HIGH DOSE

What this test checks

Higher dexamethasone dose to distinguish pituitary from adrenal Cushing's.

Why do people get this test?

Used after positive low-dose test.

When you should consider this test

• Positive low-dose dexamethasone test
• Specialist Cushing's work-up
• Doctor requested

How to prepare

Take 8mg dexamethasone at night; sample drawn morning.