Late-night salivary cortisol test
24-hour urinary free cortisol test
Overnight 1 mg dexamethasone suppression test
Low-dose dexamethasone suppression test
Repeat abnormal screening test to confirm
Plasma ACTH level
High-dose dexamethasone suppression test
CRH stimulation test
Inferior petrosal sinus sampling
Adrenal or pituitary imaging after biochemical confirmation