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Also known as: Urinary Cortisol; Salivary Cortisol; Free Cortisol; Dexamethasone Suppression Test; DST; ACTH Stimulation Test
Formal name: Cortisol

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At a Glance

Why Get Tested?

To help diagnose Cushing syndrome or primary or secondary adrenal insufficiency (Addison disease); to detect conditions affecting the pituitary or adrenal glands

When to Get Tested?

When your healthcare provider suspects excess or deficient cortisol production

Sample Required?

A blood sample drawn from a vein in your arm or a random or 24-hour urine sample; sometimes a saliva sample may be used

Test Preparation Needed?

You may be required to rest before sample collection. For a salivary cortisol test, you may be instructed to refrain from eating, drinking, or brushing your teeth for a period of time (may be some time between 15 to 30 minutes) prior to the test. Follow any instructions you are given.