CORTISOL SUPPRESSION BY DEXAMETHASONE, OVERNIGHT LOW DOSE
It is a screening test to document true hypersecretion of cortisol. Patients with Cushing syndrome of any cause will fail to suppress their cortisol secretion with a low dose of dexamethasone.
Patient to take tablet Dexamethasone orally at 11 p.m. at night and come for test next morning at 8 a.m. Patient should not be on steroid therapy.