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A cortisol test measures the level of cortisol, a hormone produced by the adrenal glands in response to stress. Cortisol plays a key role in regulating metabolism, blood sugar, and the body's response to stress. The test is typically done through blood, saliva, or urine samples, and it helps diagnose conditions like Cushing's syndrome (high cortisol levels) or Addison’s disease (low cortisol levels). Abnormal cortisol levels may indicate adrenal or pituitary gland disorders. Testing is often done in the morning when cortiso