Your doctor will ask you about your medical history and your symptoms. He or she may also perform laboratory tests to determine whether you have Addison’s disease:
Blood tests: Tests that measure the levels of certain minerals and hormones in your blood can help your doctor figure out whether you have Addison’s disease, and what might be causing it. Your doctor may also want to do special tests to check your blood before and after an injection. These tests help your doctor know whether your body is responding normally to increased levels of certain hormones, such as adrenocorticotrophic hormone (ACTH) and insulin.
Imaging tests: Your doctor may want to do a computerized tomography (CT) scan to check the size of your adrenal glands or pituitary gland and look for problems that could help identify the cause of your adrenal insufficiency.