Cortisol Blood Test Explained: Understanding Your Stress Hormone

Mar 10

Cortisol is a hormone produced by the adrenal glands and plays an important role in the body’s stress response. Blood testing can provide insight into cortisol patterns and adrenal function.

Why Stress Hormones Matter

Cortisol influences metabolism, immune function, blood pressure and energy regulation.

What Cortisol Measures

Cortisol levels fluctuate throughout the day and follow a circadian rhythm.

Levels are typically highest in the morning and gradually decline throughout the day.

Expert Insight

Professor Stafford Lightman, endocrinologist at the University of Bristol, explains: “Cortisol is central to how the body responds to stress and regulates daily physiological rhythms.”