Vitamin D 25-Hydroxy (D2,D3)


Vitamin D comes from two sources: endogenous, which is produced in the skin on exposure to sunlight, and exogenous, which is ingested in foods and supplements. The chemical structures of the types of vitamin D are slightly different, and they are named vitamin D2 (ergocalciferol, which comes from plants) and vitamin D3 (cholecalciferol, which comes from animals). The D2 form is found in fortified foods and in most vitamin preparations and supplements. Vitamin D3 is the form produced in the body and is also used in some supplements. Vitamin D2 and D3are equally effective when they are converted by the liver and the kidney into the active form, 1,25-dihydroxyvitamin D.

Vitamin D 25-Hydroxy (D2,D3)


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Pricing based on average direct to consumer pricing.

Vitamin D, 25-OH, Total; Vitamin D, 25-OH, D3; Vitamin D, 25-OH, D2

Reference Range(s)

Vitamin D, 25-OH, Total 30-100 ng/mL
Vitamin D, 25-OH, D3 Not established
Vitamin D, 25-OH, D2 Not established
  • Fasting Required: Preferred but not required
  • Preferred Specimen: Serum
  • Turnaround Time: 2 Days
  • Test Code: 92888