Table 1.

Mean ± SEM levels of diurnal serum cortisol (ug/dl) for LHPA axis assessments.

Time of day	0800	1100	1700
A
Diurnal Rhythm
Phase 1	14.64 ± 0.48	12.05 ± 0.45	9.91 ± 0.60
Phase 2	14.89 ± 0.99	15.67 ± 0.83	10.92 ± 0.89
B
Dexamethasone Suppression Test
Phase 1	–	5.33 ± 0.44	–
Phase 2	–	6.21 ± 0.96	–
Time of day	0800	0930	1230
Ca
Dexamethasone Challenge Test
Phase 1	5.71 ± 0.36	5.00 ± 0.33	2.39 ± 0.20
Phase 2	20.94 ± 0.90	16.86 ± 0.58	6.92 ± 0.30

^aDCT cortisol measurements were systematically lower in Phase 1 than Phase 2. See Section 2.5 for additional details.