25-OH vitamin D test; Calcidiol 25-hydroxycholecalciferol test

The normal range is 30.0 to 74.0 nanograms per milliliter (ng/mL).

Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

Lower than normal levels suggest a vitamin D deficiency. This condition can result from:

• Lack of exposure to sunlight
• Lack of adequate vitamin D in the diet
• Liver and kidney diseases
• Malabsorption
• Use of certain medicines, including phenytoin, phenobarbital, and rifampin

Low vitamin D levels are more common in African-American children, particularly in the winter, as well as in infants who are exclusively breastfed. Low vitamin D levels have also been associated with an increased risk of developing cancer. For more information, see the article on vitamin D deficiency.

Higher than normal levels suggest excess vitamin D, a condition called hypervitaminosis D.

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Review Date: 08/31/2010
Reviewed By: Ari S. Eckman, MD, Chief, Division of Endocrinology, Diabetes and Metabolism, Trinitas Regional Medical Center, Elizabeth, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org)