Also known as: Urinary cortisol; Salivary cortisol; Free cortisol
Formal name: Cortisol
Related tests: ACTH, Aldosterone, 17-Hydroxyprogesterone, Growth Hormone, Dexmethasone Suppression test (DST), ACTH stimulation test
Why should I do it?
To help diagnose Cushing syndrome or primary or secondary adrenal insufficiency (Addison disease); to detect conditions affecting the pituitary or adrenal glands
When should I do it?
When your doctor suspects excess or deficient cortisol production
What Kind of Sample is Needed?
A blood sample drawn from a vein in the 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.