Vitamin D, 25-Hydroxy (Calciferol)

Test Code: 1148
Download File: Vitamin D 25-Hydroxy Calciferol.pdf
CPT Codes: 82306
Methodology: CHEM
Specimen Requirements: 1 mL serum (preferred) or plasma from EDTA (lavender top) tube or heparin (green top) tube, refrigerated or frozen
Turn Around Time: 2 – 5 Days
Special Instructions: Send serum or plasma by overnight express mail, on an ice pack if refrigerated or on dry ice if frozen.
Clinical Utilities: Serum concentration of 25-OH D is considered to be the most reliable measure of overall vitamin D status and thus can be used to determine whether a patient is vitamin D sufficient.



Download File: Vitamin D 25-Hydroxy Calciferol.pdf
Utilities: Vitamin D originates from dietary and endogenous sources and is converted to 25-hydroxy Vitamin D in the liver. Serum concentration of 25-hydroxy Vitamin D is the most reliable measure of overall Vitamin D status. The result can rule out Vitamin D deficiency as the cause of bone disease. Deficien­cies of 25-hydroxy Vitamin D may be secondary to dietary deficiency, malabsorption, liver disorder or nephrotic syndrome. Elevated concentrations may be observed with excessive intake of the vitamin, or food rich in Vitamin D.
Methodology: RIA
Specimen Requirement: 1 mL Serum (Minimum: 0.5 mL), ambient, refrigerated or frozen
CPT Code: 82306
Normal Range: 9.2 – 60.0 Ng/mL
Test #: 148