QuestAssureD™ 25-Hydroxyvitamin D (D2, D3) Blood Test, LC/MS/MS
This QuestAssureD™ 25-Hydroxyvitamin D (D2, D3) test is used to help diagnose vitamin D deficiency or toxicity and monitor response to vitamin D2 or vitamin D3 supplementation.
Vitamin D3 is the main form and is produced in the skin in response to sunlight and occurs in 2 forms: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Measurement of serum 25-OH vitamin D concentrations provides 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 to hypercalcemia.
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