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The Vitamin D Test is a serum assay that quantitates 25-hydroxyvitamin D2 and 25-hydroxyvitamin D3 metabolites. The metabolite 25-hydroxyvitamin D is the major circulating form of vitamin D in the body and the best indicator of a patient’s true vitamin status due to its long half-life of 2-3 weeks. The major biologic function of vitamin D is to maintain the normal blood levels of calcium and phosphorus involved in bone mineralization. Vitamin D also influences expression of more than 2,000 genes, including those responsible for regulation of cellular proliferation, cell differentiation, apoptosis, and angiogenesis. The immune-modulating effects of vitamin D are profound, as evidenced by the many conditions which are associated with vitamin D deficiency. The range for adequate serum vitamin D is generally agreed upon in the literature.
Vitamin D Test
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