On a Blood Test What Is Cortisol?

The cortisol blood test measures the level of cortisol in the blood. Cortisol is a steroid (glucocorticoid or corticosteroid) hormone produced by the adrenal gland . Cortisol can also be measured using a urine or saliva test.

What does a blood test for cortisol show?

A cortisol test is done to measure the level of the hormone cortisol in the blood. The cortisol level may show problems with the adrenal glands or pituitary gland. Cortisol is made by the adrenal glands. Cortisol levels go up when the pituitary gland releases another hormone called adrenocorticotropic hormone (ACTH).

What should your cortisol levels be?

For most tests, normal ranges are: 6 to 8 a.m.: 10 to 20 micrograms per deciliter (mcg/dL) Around 4 p.m.: 3 to 10 mcg/dL.