Adrenocorticotropic Hormone (ACTH) Test

Adrenocorticotropic Hormone (ACTH) Test

Category
Hormones
Sample
Blood sample taken from a vein in your arm
Reports () Terms & Conditions Report time varies with time of sample collection.
In 3 days
Fasting
No Fasting
Age
5+ Years

What Is This Test?

Measures adrenocorticotropic hormone (ACTH), the pituitary hormone that tells the adrenal glands to make cortisol.

Why this test is performed?

Used with cortisol to find the cause of too much or too little cortisol — distinguishing pituitary, adrenal and other sources in Cushing's syndrome and Addison's disease.

Who should take this test?

Symptoms suggesting hormonal imbalance — weight change, fatigue, BP changes, growth problems — usually as advised by a doctor.

Test Preparation

No fasting needed.

Medical disclaimer · for information only, not medical advice

This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.

In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.

Read our Editorial Policy and Medical Review Process.

Frequently asked questions

ACTH is unstable; the sample is collected in the morning in a chilled tube and processed quickly.

No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.

Blood sample taken from a vein in your arm.

Usually within 31–55 hours after the sample reaches the lab. You will receive the report online.

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