A 24-hour urine test is used more often than a
cortisol blood test to diagnose Cushing's syndrome. To learn more about
cortisol in urine, see the topic
Cortisol in Urine.
Other tests that can
help determine if the pituitary gland or adrenal glands are functioning
properly include the adrenocorticotropic hormone (ACTH) stimulation test and
dexamethasone suppression tests. The ACTH stimulation test may be done when
Addison's disease is suspected.