There is no single gold-standard test to diagnose Cushing's syndrome. Current standard practice relies on the low-dose dexamethasone suppression test (LDDST). It has been proposed, however ...

Suppression ... more than 2 weeks), or are abruptly tapered or withdrawn. Dexamethasone provided 4 mg at every 6 hours, the usual initial dose—equivalent to 400 mg of cortisol per day—is ...