Vitamin D (1,25 Dihydroxy)
Label Mnemonic: VD125S
Epic code: LAB536
Downtime form: A-1a Doctor/Provider Orders - Pathology Core and Specialty Care Nursery
Commercial Mail-out Laboratory
5231 RCP
Collection Medium:
Red top tube 5 mL (Clot Activator)
Preferred Minimum: 1 mL serum
Absolute Minimum: 0.5 mL serum
Rejection Criteria:
SST or gels tubes are not appropriate (per Medical Director, Core Pathology).
Delivery Instructions:
Deliver to laboratory immediately after collection.
Turn Around Time:
24 hours upon receipt at reference laboratory (upon receipt in laboratory)
Reference Range:
19.9 - 79.3 pg/mL
Interpretive Data:
Measurement of "Vitamin D (1,25-dihydroxy)" is intended for workup of complex vitamin D issues in the assessment of hypercalcemia, assessment of vitamin D in patients with renal failure, and certain malignancies. This assay is NOT intended for routine assessment of Vitamin D nutritional status (see "Vitamin D, 25-Hydroxy, Plasma").

This test is primarily indicated during patient evaluation for hypercalcemia and renal failure. A normal result does not rule out Vitamin D deficiency. The recommended test for diagnosing Vitamin D deficiency is Vitamin D 25-hydroxy.
Quantitative Chemiluminescent Immunoassay
CPT Code:
See also:
Vitamin D, 25-Hydroxy, Plasma
See Additional Information:
Specimens Requiring Immediate Delivery