Hormone Health Hub: Expert Insights on Testing, Balance & Better Living — HPA Axis Dysfunction
The Cortisol Awakening Response (CAR) and Adrenal Function
Posted by Hormone Lab UK Editorial Team on
The Cortisol Awakening Response (CAR) — the 50% surge in cortisol that occurs in the first 30 minutes after waking — is one of the most sensitive markers of HPA axis health. Discover how CAR differs from the standard diurnal cortisol curve, which conditions are linked to blunted or exaggerated CAR, and how three timed morning saliva samples can reveal adrenal function in ways a single cortisol test cannot.
Diurnal Fluctuations in Norepinephrine and Epinephrine Levels as Part of the Healthy Stress Response
Posted by Dr. Kate Placzek on
Norepinephrine and epinephrine follow a distinct diurnal rhythm — rising through the morning, peaking in the afternoon, and falling at night. When this pattern is disrupted by chronic stress, the consequences ripple through every hormonal system in the body. Learn how the stress response works and how dried urine testing can reveal imbalances.