What Is a Normal Cortisol Level?
The normal Cortisol range is 6.2–19.4 mcg/dL (AM draw). Values below or above this range may indicate a condition that requires further evaluation.
Reference Range Table
| Marker | Low | Normal | High |
|---|---|---|---|
| Cortisol (Morning) | Below 6.2 mcg/dL — adrenal insufficiency possible | 6.2–19.4 mcg/dL (AM draw) | Above 19.4 mcg/dL — Cushing's or chronic stress |
What Affects Your Results
Time of day (must be drawn in AM for standard interpretation), acute stress or illness, sleep deprivation, shift work, oral contraceptives (raise cortisol-binding globulin), and corticosteroid medications.
When to Retest
If an initial result is abnormal, repeat with a morning draw (7-9 AM). If evaluating treatment, per your endocrinologist's schedule.
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