Vitamin D, 25-Hydroxyvitamin D (D2, D3)

Blood Test Types

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Vitamin D - QuestAssureD™ 25-Hydroxyvitamin D (D2, D3), LC/MS/MS (3 Biomarkers)
  • Vitamin D, 25-Oh, D2
  • Vitamin D, 25-Oh, D3
  • Vitamin D, 25-Oh, Total
Doctor/Practitioner
Certain lab tests may come back in the "normal" range. Reference ranges do not always mean "optimal." Patients may still experience symptoms in the "normal" range. It is important to speak with a qualified health practitioner regarding normal vs optimal.
Note
These lab tests can be purchased without a physician and drawn at a Quest Diagnostics location. A small draw fee of $ 8 will be applied at checkout. There are no other "hidden" fees unless noted on the lab test.
Currently, NY, NJ, and RI state laws prohibit direct-access testing. These lab tests cannot be conducted at lab locations within these states at this time.

Measurement of serum 25-OH vitamin D concentrations provide a good index of circulating vitamin D activity in patients not suffering from renal disease. Lower than normal 25-OH vitamin D levels can result from a dietary deficiency, poor absorption of the vitamin or impaired metabolism of the sterol in the liver. A 25-OH vitamin D deficiency can lead to bone diseases such as rickets and osteomalacia. Above normal levels can lead hypercalcemia. This assay employs liquid chromatography tandem mass spectrometry to independently measure and report the two common forms of 25-hydroxy vitamin D: 25OH D3 - the endogenous form of the vitamin and 25OH D2 - the analog form used to treat 25OH Vitamin D3 deficiency.

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