Cortisol (Morning) Test
Category
Hormones
Specimen
Blood
Organ System
—
Available At
0 labs
About Cortisol (Morning) Test
Cortisol is the body's primary stress hormone, produced by the adrenal glands, and it plays essential roles in regulating metabolism, blood pressure, immune response, and the body's reaction to physical and emotional stress.
Cortisol naturally follows a distinct daily rhythm, rising to its peak shortly after waking in the morning and gradually declining throughout the day to its lowest point around midnight — a pattern that's fundamental to how this test is interpreted.
Because of this rhythm, a morning cortisol test captures the hormone at its expected peak, making abnormal results — either unusually high or unusually low at this specific time — particularly meaningful for identifying adrenal gland dysfunction.
Conditions affecting cortisol production can range from mild and manageable to serious and requiring urgent treatment, which is why this test is often just the first step in a broader adrenal function workup when results fall outside the expected range.
When Should You Get Cortisol (Morning) Test
Cortisol testing is ordered for:
- Unexplained fatigue combined with weight changes
- Suspected adrenal gland disorders
- Symptoms suggesting Cushing's syndrome, such as rapid weight gain and skin changes
- Symptoms suggesting Addison's disease, such as fatigue, weight loss, and low blood pressure
- Investigating unexplained low blood pressure or salt cravings
Conditions Cortisol (Morning) Test Can Detect
This test helps diagnose:
- Cushing's syndrome (excess cortisol production)
- Addison's disease (insufficient cortisol production)
- Pituitary gland disorders affecting adrenal function
- Adrenal gland tumors, in some cases
How to Prepare for Cortisol (Morning) Test
- Testing is typically scheduled between 7 and 9 AM, when cortisol is naturally at its peak.
- Avoid strenuous exercise and significant stress in the hours before the test, as both can artificially raise cortisol levels.
- Get adequate sleep the night before, since disrupted sleep patterns can affect the normal cortisol rhythm.
- Inform your doctor of any steroid medications you're taking, as these directly affect cortisol levels and interpretation.
Cortisol (Morning) Test Normal Reference Ranges
| Parameter | Normal Range |
|---|---|
| Morning (7–9 AM) | 5–23 µg/dL |
An unexpectedly low morning cortisol can suggest adrenal insufficiency, while an unexpectedly high level may point toward Cushing's syndrome — either finding typically prompts additional, more specific testing to confirm the diagnosis and identify the underlying cause.
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Frequently Asked Questions About Cortisol (Morning) Test
Why does timing matter so much for cortisol testing?
Cortisol follows a strong daily rhythm, naturally peaking in the morning and dropping to its lowest point at night, so results are only meaningful when interpreted against the expected time of day the sample was drawn.
Can stress before the test affect my result?
Yes, both physical and emotional stress can temporarily raise cortisol levels, so a calm, rested state before the blood draw helps ensure the most accurate result.
Is one abnormal cortisol test enough for a diagnosis?
Usually not — an abnormal result typically leads to additional, more specific tests (such as an ACTH stimulation test or dexamethasone suppression test) to confirm the diagnosis and pinpoint the underlying cause.
Medical Disclaimer: This page is for informational purposes only and does not constitute medical advice. Lab test results should always be interpreted by a qualified healthcare professional in the context of your clinical history. Do not self-diagnose or alter your treatment based on test results alone.
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