25 OH Vitamin D blood test, often called the Vitamin D Test, is the most accurate way to measure the body's vitamin D status.
Purpose Assess Vitamin D Status: Measures the main circulating form of Vitamin D (Calcidiol), reflecting total intake from sun exposure, diet, and supplements.
Diagnose Deficiency or Insufficiency: Used to determine if levels are too low, which can lead to bone disorders like rickets in children and osteomalacia/osteoporosis in adults.
Monitor Treatment: Evaluates the effectiveness of vitamin D supplementation in patients with diagnosed deficiency.
Investigate Abnormal Calcium/Phosphate: Used in the workup for conditions affecting calcium metabolism, bone health, or parathyroid function.