MX Vitamin D Test - DBS

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The Most Common Vitamin Deficiency in the United States

The Vitamin D Test is a serum or dried blood spot analysis 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. 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 that are associated with Vitamin D deficiency.


  • 25-hydroxyvitamin D2
  • 25-hydroxyvitamin D3

Specimen Requirements

Dry Blood Spot: Five full dried blood spots. 

Please see collection instructions for detailed instructions.