Circadian profiles of the serum levels of cortisol and five androgens
were studied in 20 females including 8 controls, 7 patients with ACTH-
dependent Cushing's syndrome and 5 with hypercortisolism due to adrena
l adenoma. A significant 24-h periodicity was found for each steroid i
n all groups. Besides hypercortisolaemia, a significant increase of 11
-hydroxyandrostenedione was shown in both forms of Cushing's syndrome.
The most conspicuous finding was a decreased dehydroepiandrosterone a
nd its sulphate in adrenal adenoma. The peaks for the studied steroids
were shifted from the morning hours towards the noon in ACTH-dependen
t Cushing's syndrome and towards the evening (for cortisol) and night
hours (for androgens) in adrenal adenoma.