Diagnosis of vitamin D deficiency, differential diagnosis of causes of rickets and osteomalacia, monitoring vitamin D replacement therapy, and diagnosis of hypervitaminosis D.
Optimal: 25 - 100 ng/mL; Deficiency: <10 ng/mL; Toxicity: >150 ng/mL.
Samples containing fluorescein may produce falsely elevated values with this assay. Samples should be obtained at least 48 to 72 hours post treatment.
- 25-hydroxy Vitamin D
- Vitamin D 25-OH
- Vitamin D2
- Vitamin D3
- 25-Hydroxyvitamin D, Total
Collect blood in red top or SST tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate up to 6 days or freeze for longer storage.