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Answer · hormone optimization

What is morning cortisol (cortisol AM)?

Short answer

Cortisol AM reflects morning adrenal output and a healthy cortisol awakening response. It is most meaningful when drawn between 7–9 AM.

Reviewed by Dr. Laura PurdyMay 29, 2026

Full answer

Cortisol AM captures the peak of the diurnal cortisol rhythm. A robust morning cortisol supports energy, glucose regulation, immune balance, and stress response. Both deficient and excessive morning cortisol are clinically meaningful: low cortisol AM raises adrenal insufficiency concerns, while elevated cortisol AM can reflect stress physiology, exogenous steroid use, or Cushing's syndrome. Within oMeds review, cortisol AM is interpreted alongside DHEA-S, ACTH (when ordered), sleep history, and clinical symptoms, and the 7–9 AM draw window matters.

Educational. Not a substitute for individualized provider review.

References & sources
  • Cortisol AM — Primary source · oMeds
  • Reviewed by Dr. Laura Purdy, MD, MBA · Clinical Director, oMeds · Last reviewed 2026-05-29

Related answers

What is DHEA-S?
DHEA-S (dehydroepiandrosterone sulfate) is the stable, sulfated reservoir of DHEA produced by the adrenal cortex. It is the standard marker of adrenal androgen output and declines steadily with age. It is read alongside cortisol, testosterone, and SHBG.
Low morning energy?
Low morning energy commonly reflects poor sleep quality, blunted cortisol awakening response, low testosterone, thyroid dysfunction, anemia, or metabolic dysregulation.
Primary source
Cortisol AM