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Cortisol blood test

Serum cortisol

 

The cortisol blood test measures the level of cortisol in the blood. Cortisol is a steroid (glucocorticoid) hormone produced by the adrenal gland .

Cortisol can also be measured using a urine or saliva test.

How the Test is Performed

 

A blood sample is needed .

 

How to Prepare for the Test

 

Your doctor 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 exercising the day before the test.

You may also be told to temporarily stop taking medicines that can affect the test, including:

  • Anti-seizure drugs
  • Estrogen
  • Human-made (synthetic) glucocorticoids, such as hydrocortisone, prednisone and prednisolone
  • Androgens

 

How the Test will Feel

 

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.

 

Why the Test is Performed

 

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 plays a role in:

  • Bone growth
  • Blood pressure control
  • Immune system function
  • Metabolism of fats, carbohydrates, and protein
  • Nervous system function
  • Stress response

Different diseases, such as Cushing syndrome and Addison disease , can lead to either too much or too little production of cortisol. Measuring blood cortisol level can help diagnose these conditions. It is also measured to evaluate how well the pituitary and adrenal glands are working.

Other conditions for which the test may be ordered include:

  • Acute adrenal crisis , a life-threatening condition that occurs when there is not enough cortisol
  • Sepsis , an illness in which the body has a severe response to bacteria or other germs
  • Low blood pressure

 

Normal Results

 

Normal values for a blood sample taken at 8 in the morning are 6 to 23 micrograms per deciliter (mcg/dL) or 165.53 to 634.52 nanomoles per liter (nmol/L).

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or may test different specimens. Talk to your doctor about the meaning of your specific test results.

 

What Abnormal Results Mean

 

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 gland that is producing too much cortisol

A lower than normal level may indicate:

  • Addison disease, in which the adrenal glands do not produce enough cortisol
  • Hypopituitarism , in which the pituitary gland does not signal the adrenal gland to produce enough cortisol
  • Suppression of normal pituitary or adrenal function by glucocorticoid medicines including pills, skin creams, eyedrops, inhalers, joint injections, chemotherapy

 

Risks

 

Veins and arteries vary in size from one person to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

  • Excessive bleeding
  • Fainting or feeling lightheaded
  • Hematoma (blood accumulating under the skin)
  • Infection (a slight risk any time the skin is broken)

 

 

References

Chernecky CC, Berger BJ. Cortisol - plasma or serum. In: Chernecky CC, Berger BJ, eds. Laboratory Tests and Diagnostic Procedures . 6th ed. Philadelphia, PA: Elsevier Saunders; 2013:388-389.

Stewart PM, Newell-Price JDC. The adrenal cortex. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, eds. Williams Textbook of Endocrinology . 13th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 15.

 

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              Review Date: 10/28/2015

              Reviewed By: Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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