ACTH blood test

Explanation

ACTH is a hormone, a chemical messenger made by the pituitary gland at the base of the brain. It tells the adrenal glands above the kidneys to make cortisol. An ACTH blood test helps investigate why cortisol levels are abnormal.

Why is cortisol measured too?

Cortisol helps regulate blood pressure, blood sugar and the response to stress. Normally, low cortisol prompts the body to make more ACTH. Higher cortisol reduces that signal.

Comparing the two results helps doctors work out whether a problem may involve the adrenal glands or the signals controlling them. ACTH alone cannot establish the cause. Further tests may be needed.

Does the time of the test matter?

ACTH changes during the day. Blood is often taken in the morning, when levels are higher. Use the laboratory range for that sample rather than a number from another test. Tell the clinician about your medicines and follow the preparation instructions. Do not stop prescribed medicines on your own.

Report excerptExplanation

Confusing Medical Report?

BaluMed makes medicine understandable! Our extensive medical report explanation 'translates' complex medical terms from MRI findings and discharge summaries into easily understandable language. With a combination of artificial intelligence and medical expertise, we offer quickly available and reliable information.

  • Extensive. Summary, explanation per section, glossary.
  • Fast & Reliable. Doctor-reviewed, within 24 hours.
  • Privacy. Documents are automatically anonymized.
  • Multilingual. German, English, Spanish or Italian.