When is this performed?

  • To clarify whether a patient has Cushing`s syndrome

What does the test involve?

  • The administration of Dexamethasone at 6hrly intervals for 2 days and the taking of blood samples to measure cortisol and ACTH levels.

Are there any side-effects?

  • Usually none

How long does the test take and is admission to hospital required?

  • The test takes about 3 days and does not usually require admission

What should you tell your doctor?

  • If you are taking steroid medication by any route: oral, topical, inhaled, injection

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