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