Cortisol
Cortisol is the main stress hormone produced by the adrenal glands. It regulates metabolism, blood pressure, and stress response. Levels peak in the morning and fall by evening.
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Normal ranges
Morning (8 AM): 170–540 nmol/L. Evening values are roughly 2–4 times lower.
Units: nmol/L
Causes of deviations
Low levels:
Adrenal insufficiency, pituitary disorders, long-term corticosteroid withdrawal.
High levels:
Stress, Cushing's syndrome, depression, corticosteroid medications.
When to see a doctor
If abnormal with fatigue, weight changes, or blood pressure issues — endocrinologist.
Related biomarkers
Panels
Hormone panel
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