Your doctor will examine your skin for any evidence of brownish discolouration (hyperpigmentation), particularly in certain areas, such as: where skin creases on your palm, in your elbow crease, on any scars and your lips and gums. However, hyperpigmentation doesn’t occur in all cases of Addison’s disease. If Addison’s disease is suspected, blood tests will be carried out to measure the levels of sodium, potassium and cortisol in your body. A low sodium, high potassium or low cortisol level may indicate Addison’s disease. You may need to see an endocrinologist for your blood to be tested for the following: a low level of the hormone aldosterone, a high level of adrenocorticotrophic hormone (ACTH), a low level of glucose (sugar used for energy) and positive adrenal antibodies (antibodies designed to attack the adrenal gland).