Adrenal insufficiency can be difficult to diagnose. Your doctor will begin by asking about your medical history and about any obvious symptoms you are experiencing. Tests that measure the levels of cortisol and aldosterone are used to make a definite diagnosis and include the following:
ACTH Stimulation Test: This is the most specific test for diagnosing adrenal insufficiency. Blood cortisol levels are measured before and after a synthetic form of adrenocorticotrophic hormone (ACTH), a hormone secreted from the anterior pituitary, is given by injection.