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Cortisol: normal range & what your result means
Cortisol is the body’s main stress hormone, following a daily rhythm — high in the morning, low at night. It is tested for adrenal problems.
Typical adult reference range
| Measure | Range |
|---|---|
| Morning (8 am) | ≈ 6–23 µg/dL |
| Evening | Lower than morning |
What a HIGH result can mean
- High cortisol (Cushing’s) can cause weight gain, high blood pressure, easy bruising and high sugar
What a LOW result can mean
- Low cortisol (Addison’s/adrenal insufficiency) can cause fatigue, low blood pressure and weight loss — and can be an emergency in a crisis
Ranges vary by lab. Reference ranges are TYPICAL ADULT values and vary by laboratory, age, sex, pregnancy and the method used. Always read your result against the range printed on YOUR report, and let your doctor interpret it alongside your history.
Frequently asked questions
Why is cortisol measured in the morning?
Cortisol peaks in the early morning and falls through the day, so timing matters. Abnormal rhythms or levels prompt further specialised testing.
What is an adrenal crisis?
A dangerous shortage of cortisol causing very low blood pressure, vomiting and collapse — a medical emergency needing immediate treatment, seen in adrenal insufficiency.
Explore more
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.