Nonsuppressible Oral Dexamethasone Suppression Tests but Not Cushing Syndrome

Table 3

ACTH and cortisol dynamics during the intravenous dexamethasone suppression test.

4 mg IV DST	S. cortisol	ACTH
0 hr	13.51 mcg/dL	20.92 pg/mL
4 hr	2.72 mcg/dL	<1 pg/mL
5 hr	2.05 mcg/dL	<1 pg/mL
24 hr	0.43 mcg/dL	<1 pg/mL