Service Description

The Vitamin D 25-OH (D2/D3) test measures both forms of vitamin D—ergocalciferol (D2) and cholecalciferol (D3)—in the blood to provide a complete assessment of vitamin D status, important for bone health, calcium regulation, and immune function. Why it’s done: To detect vitamin D deficiency or insufficiency To evaluate overall bone health and risk of osteoporosis To monitor immune system function and chronic disease risk To guide dietary supplementation or treatment plans To assess nutritional status and response to vitamin D therapy Specimen Type: Blood (serum or plasma) Turnaround Time: Typically 1–3 business days Collection Available: In-office or mobile blood draw services