Serum Cortisol Test

The Serum Cortisol test measures cortisol levels, a hormone produced by the adrenal cortex. Cortisol levels vary throughout the day and are influenced by stress, sleep, and illness. Abnormal levels may indicate conditions like Cushing’s syndrome (high cortisol) or Addison’s disease (low cortisol). Symptoms vary significantly based on the underlying condition but may include weight changes, fatigue, and mood swings.