Cortisol blood test

A blood sample is needed .

Your health care provider will likely have you do the test early in the morning. This is important because cortisol level varies throughout the day. You may be asked not to do any vigorous exercise the day before the test. You may also be told to temporarily stop taking medicines that can affect the test, including:…

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterward, there may be some throbbing or slight bruising. This soon goes away.

The test is done to check for increased or decreased cortisol production. Cortisol is a glucocorticoid (steroid) hormone released from the adrenal gland in response to adrenocorticotropic hormone (ACTH). ACTH is a hormone released from the pituitary gland in the brain. Cortisol affects many different body systems. It…

Normal values for a blood sample taken at 8 in the morning are 5 to 25 mcg/dL or 140 to 690 nmol/L. Normal values depend on the time of day and the clinical context. Normal ranges may vary slightly among different laboratories. Some labs use different measurements or may test different specimens. Talk to your provider…

A higher than normal level may indicate: Cushing disease , in which the pituitary gland makes too much ACTH because of excess growth of the pituitary gland or a tumor in the pituitary gland Ectopic Cushing syndrome , in which a tumor outside the pituitary or adrenal glands makes too much ACTH Tumor of the adrenal…

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others. Other risks associated with having blood drawn are slight, but may include: Excessive…

Guber HA, Oprea M, Russell YX. Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods . 24th ed. Philadelphia, PA: Elsevier; 2022:chap 25. Newell-Price JDC, Auchus RJ. The adrenal cortex. In: Melmed S, Auchus, RJ, Goldfine AB, Koenig RJ,…