The evaluation of Addison's disease begins with a medical history and physical examination.

Physical findings in those with Addison's disease may include:

• Unusually dark skin
• Low blood pressure
• Low body weight
• Muscle weakness

Testing is necessary to confirm the diagnosis of Addison's disease.

Tests for Addison's disease may include:

• Kidney profile
• Serum cortisol level
• Serum electrolytes
• ACTH stimulation test
• Glucose tolerance testing
• Serum magnesium level
• Serum aldosterone level
• Urine 17 ketosteroids
• Urine osmolality
• CT scanning of the abdomen
• Ultrasound of the abdomen
• MRI scan of the abdomen