Cortisol, A.M. Test
A Cortisol, A.M. test measures cortisol, the main adrenal stress hormone, from a sample collected in the morning. Because cortisol follows a daily rhythm, this test is timed on purpose so a clinician can read the result in the right context.
About this test
Cortisol is made by the adrenal glands, small glands that sit above the kidneys, and it helps the body respond to stress while supporting energy, blood sugar, and blood pressure. Cortisol rises and falls across the day in a natural rhythm, generally running higher earlier and easing later on.
The test is done with a simple blood draw at a patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and the sample goes to the laboratory.
Who might consider this test?
- Because the morning timing is chosen deliberately, this test is usually part of a clinician-guided evaluation rather than a routine self-check.
Test details
| Quest code | 4212 |
|---|---|
| Methodology | Immunoassay |
| Sample type | 1 mL serum |
| Collection | Quest patient service center |
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Additional details
What this test looks at
This test measures cortisol at a set point in the morning. Cortisol sits at the end of a feedback loop that runs from the brain to the adrenal glands, and the amount circulating shifts through the day. By fixing the collection time to the morning, the test captures cortisol at a consistent part of its rhythm, which makes the result more meaningful to compare and interpret.
It helps to remember what a single timed result is and is not. It describes how much cortisol is present at that moment in the day; it does not, by itself, label the cause of a symptom or confirm the popular term "adrenal fatigue," which is not a recognized medical diagnosis.
How it's often used alongside other tests
A morning cortisol result is frequently read together with other markers. A clinician may pair it with an evening cortisol test to see how the hormone changes across the day, or with ACTH to compare the pituitary's signal against the adrenal glands' response. Read together, these markers offer a fuller sense of the adrenal system than a single timed value can on its own.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
Why is this cortisol test done in the morning?
Cortisol follows a daily rhythm and tends to be more active earlier in the day. Collecting the sample in the morning captures a consistent part of that rhythm, which helps a clinician interpret the result in context.
What does a morning cortisol test measure?
It measures the level of cortisol, the main adrenal stress hormone, in a blood sample taken in the morning. Cortisol comes from the adrenal glands above the kidneys and reflects part of the body's stress-hormone system.
Do I need to time my visit carefully?
Yes. Because cortisol changes across the day, plan to have the sample collected at the time your test or clinician specifies. Following that timing helps make the result meaningful.
Is this test paired with other markers?
Often. A clinician may pair a morning cortisol with an evening cortisol to see the daily change, or with ACTH to compare the brain's signal against the adrenal response. This gives a fuller view than one value alone.
Can this test diagnose adrenal fatigue?
No. Adrenal fatigue is a popular term but not a recognized medical diagnosis, and no test confirms it. A cortisol result describes how the hormone is behaving, which a clinician interprets alongside symptoms and history.
How much is a Cortisol A.M. test?
$39, paid once at checkout. The price includes the physician's order this test requires and sample collection at a Quest patient service center.