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Vitamin D Tests

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Also known as: Ergocalciferol (Vitamin D2); Cholecalciferol (Vitamin D3); Calcidiol (25-hydroxyvitamin D[25(OH)D]); Calcifidiol (25-hydroxy-vitamin D); Calcitriol (1,25 dihydroxy-vitamin D [1,25(OH)(2)D])
Formal name: 25-hydroxyvitamin D; 1,25 dihydroxyvitamin D

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NOTE: This article is based on research that utilizes the sources cited here as well as the collective experience of the Lab Tests Online Editorial Review Board. This article is periodically reviewed by the Editorial Board and may be updated as a result of the review. Any new sources cited will be added to the list and distinguished from the original sources used.

Sources Used in Current Review

Topiwala, S. (Updated 2012 July 19). 25-hydroxy vitamin D test. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/003569.htm. Accessed February 2013.

Rennert, N. (Updated 2011 December 11). Hypervitaminosis D. MedlinePlus Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/001594.htm. Accessed February 2013.

Tangpricha, V. and Khazai, N. (Updated 2012 December 10). Vitamin D Deficiency and Related Disorders. Medscape Reference. [On-line information]. Available online at http://emedicine.medscape.com/article/128762-overview through http://emedicine.medscape.com. Accessed February 2013.

Nguyen, H. and Chernoff, A. (Updated 2012 April 20). Vitamin D3 25-Hydroxyvitamin D. Medscape Reference. [On-line information]. Available online at http://emedicine.medscape.com/article/2088694-overview#showall through http://emedicine.medscape.com. Accessed February 2013.

Nguyen, H. and Chernoff, A. (Updated 2012 April 20). Vitamin D3 1,25-Dihydroxyvitamin D. Medscape Reference. [On-line information]. Available online at http://emedicine.medscape.com/article/2088672-overview#showall through http://emedicine.medscape.com. Accessed February 2013.

(2011 September). Vitamin D Insufficiency. Mayo Clinic Mayo Medical Laboratories Communique. [On-line information]. Available online at http://www.mayomedicallaboratories.com/articles/communique/2011/09.html through http://www.mayomedicallaboratories.com. Accessed February 2013.

Johnson, L. (Revised 2012 December). Merck Manual for Healthcare Professionals [On-line information]. Available online through http://www.merckmanuals.com. Accessed February 2013.

Pagana, K. D. & Pagana, T. J. (© 2011). Mosby's Diagnostic and Laboratory Test Reference 10th Edition: Mosby, Inc., Saint Louis, MO. Pp 1040-1043.

Clarke, W., Editor (© 2011). Contemporary Practice in Clinical Chemistry 2nd Edition: AACC Press, Washington, DC. Pp 529-530.

McPherson, R. and Pincus, M. (© 2011). Henry's Clinical Diagnosis and Management by Laboratory Methods 22nd Edition: Elsevier Saunders, Philadelphia, PA. Pp 105-106.

Press release. IOM Report Sets New Dietary Intake Levels for Calcium and Vitamin D To Maintain Health and Avoid Risks Associated With Excess. Institute of Medicine. Available online at http://www8.nationalacademies.org/onpinews/newsitem.aspx?RecordID=13050 through http://www8.nationalacademies.org. Issued November 30, 2010. Accessed March 2010.

Report at a Glance. DRIs for Calcium and Vitamin D. Institute of Medicine. Available online at http://www.iom.edu/Reports/2010/Dietary-Reference-Intakes-for-Calcium-and-Vitamin-D/DRI-Values.aspx through http://www.iom.edu. Published November 30, 2010. Accessed March 2010.

(March 2011) Centers for Disease Control and Prevention. Vitamin D Status, United States, 2001-2006. Available online at http://www.cdc.gov/nchs/data/databriefs/db59.htm#ref1 through http://www.cdc.gov. Accessed March 2013.

Holick MF et al. Evaluation, treatment, and prevention of vitamin D deficiency: An Endocrine Society clinical practice guideline. J Clin Endocrinol Metab, 96(7): 1911 (July 1, 2011). Available online at http://dx.doi.org/10.1210/jc.2011-0385 through http://dx.doi.org. Accessed May 2013.

Sources Used in Previous Reviews

Thomas, Clayton L., Editor (1997). Taber's Cyclopedic Medical Dictionary. F.A. Davis Company, Philadelphia, PA [18th Edition].

Pagana, Kathleen D. & Pagana, Timothy J. (2001). Mosby's Diagnostic and Laboratory Test Reference 5th Edition: Mosby, Inc., Saint Louis, MO.

NIH (2001 August 07, Updated). Vitamin D. NIH Clinical Center, National Institutes of Health. Facts About Dietary Supplements [On-line information]. Available online at http://www.cc.nih.gov/ccc/supplements/vitd.html through http://www.cc.nih.gov.

Oltikar, A. (2001 February 09). Vitamin D. MEDLINEplus Health Information, Medical Encyclopedia [On-line information]. Available online at http://www.nlm.nih.gov/medlineplus/ency/article/002405.htm.

Conlan, R. & Sherman, E., et. al (2001). UNRAVELING THE ENIGMA OF VITAMIN D. The National Academies, National Academy of Sciences Beyond Discovery, The path from research to human benefit [On-line Journal]. Available online at http://www.beyonddiscovery.org/content/view.article.asp?a=414 through http://www.beyonddiscovery.org.

Vitamin D Home Page. About Vitamin D. University of California, Riverside, Vitamin D Home Page [On-line information]. Available online at http://vitamind.ucr.edu/about.html through http://vitamind.ucr.edu.

DeLuca, H. (2001 January 18, Updated). Vitamin D. Linus Pauling Institute [On-line information]. Available online at http://www.orst.edu/dept/lpi/infocenter/vitamins/vitaminD/ through http://www.orst.edu.

Miller-Keane Medical Dictionary (2000). Vitamin. WebMDHealth, Dictionary [On-line information]. Available online at http://my.webmd.com/content/asset/miller_keane_35600 through http://my.webmd.com.

Merck. Vitamins and Minerals. The Merck Manual of Medical Information--Home Edition [On-line information]. Available online at http://www.merck.com/pubs/mmanual_home/sec12/135.htm through http://www.merck.com.

Clinical Diagnosis and Management by Laboratory Methods. 21st ed. Henry JB, ed. New York: Saunders: 2006.

(November 2006) Quest Diagnostics. Vitamin D, 25-Hydroxy, Test Summary (online information). Available online at http://www.questdiagnostics.com/hcp/topics/endo/vitamin_d.html through http://www.questdiagnostics.com.

(November 2006) ARUP Laboratory. Vitamin D, 25-Hydroxy, Test Directory (online information). Available online at http://www.aruplab.com/guides/ug/tests/0070277.jsp through http://www.aruplab.com.

Saenger AK, et al. Quantification of Serum 25-Hydroxyvitamin D2 and D3 Using HPLC-Tandem Mass Spectrometry and Examination of Reference Intervals for Diagnosis of Vitamin D Deficiency. American Journal of Clinical Pathology 2006;125:914-920.

Utiger RD. The Need for More Vitamin D. New England Journal of Medicine 1998; 33:828-829.

Mayo Medical Laboratories. Vitamin D Testing. Available online at http://www.mayomedicallaboratories.com/articles/vitamind/index.html through http://www.mayomedicallaboratories.com. Accessed February 2009.

National Osteoporosis Foundation. Prevention, Vitamin D. Available online at http://www.nof.org/prevention/vitaminD.htm through http://www.nof.org. Accessed February 2009.

Bikle D. Nonclassic Actions of Vitamin D. J Clin Endocrinol Metab 2009; 94: 26-34.

Mark S, Gray-Donald K, Delvin EE, O'Loughlin J, Paradis G, Levy E, Lambert M. Low vitamin D status in a representative sample of youth from Quebec, Canada. Clinical Chemistry 2008 Aug; 54(8): 1283-9.