Dexamethasone suppression test,”Give 1mg dexamethasone at 11pm, measure cortisol at 8am. If serum cortisol <5, exclude Cushing syndrome. If >5, Cushing syndrome is positive and high-dose dexamethasone test is done to determine cause –> if ectopic

Dexamethasone suppression test,”Give 1mg dexamethasone at 11pm, measure cortisol at 8am. If serum cortisol <5, exclude Cushing syndrome. If >5, Cushing syndrome is positive and high-dose dexamethasone test is done to determine cause –> if ectopic

no suppression.”