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.
| Measure | Range |
|---|---|
| Morning (8 am) | ≈ 6–23 µg/dL |
| Evening | Lower than morning |
Cortisol peaks in the early morning and falls through the day, so timing matters. Abnormal rhythms or levels prompt further specialised testing.
A dangerous shortage of cortisol causing very low blood pressure, vomiting and collapse — a medical emergency needing immediate treatment, seen in adrenal insufficiency.
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.