Cortisol Morning Sample 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 2 days
- Fasting
- Required
- Fasting Hours
- 10-12 hours
- Age
- 5+ Years
What Is This Test?
Measures cortisol, the main stress hormone made by the adrenal glands, in a morning sample.
Why this test is performed?
Low morning cortisol suggests adrenal insufficiency (Addison's disease or after long-term steroid use); it is also part of the work-up for Cushing's syndrome.
Who should take this test?
Symptoms suggesting hormonal imbalance — weight change, fatigue, BP changes, growth problems — usually as advised by a doctor.
Test Preparation
Fast for 10–12 hours as advised by the lab and give the sample between 7 AM and 9 AM. Tell your doctor if you take steroid tablets, creams or inhalers.
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.
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Frequently asked questions
Cortisol follows a daily rhythm — highest in the early morning and lowest late at night — so the time of collection changes how results are interpreted.
Fast for 10–12 hours as advised by the lab and give the sample between 7 AM and 9 AM. Tell your doctor if you take steroid tablets, creams or inhalers.
Blood sample taken from a vein in your arm.
Usually within 10–34 hours after the sample reaches the lab. You will receive the report online.
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