Diagnostics·Diagnostics
Cortisol blood test
Informed by recognized medical guidance
Overview
A cortisol blood test measures the level of cortisol, a hormone often called the 'stress hormone,' in your blood. Cortisol helps your body respond to stress, control blood sugar, reduce inflammation, and manage many other functions. This test helps doctors check whether your adrenal glands and pituitary gland are working properly.
Key facts
- Cortisol levels naturally change throughout the day, usually peaking in the morning and dropping at night.
- High or low cortisol can point to different health issues, such as Cushing's syndrome or Addison's disease.
- The test is often done early in the morning, when cortisol is usually highest.
The cortisol blood test is a common test ordered when a doctor suspects a problem with the adrenal glands or pituitary gland. Not everyone needs this test.
Anyone can have a cortisol blood test if their doctor recommends it. It is often done in people with symptoms that suggest too much or too little cortisol.