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125VD / DHVD-M
VITAMIN D, 1,25-DIHYDROXY, SERUM

Test Code 125VD / DHVD-M 
Test VITAMIN D, 1,25-DIHYDROXY, SERUM 
Methodology Extraction / Liquid Chromatography-Tandem Mass
Spectrometry (LC-MS/MS) 
Description Useful for the differential diagnosis of hypercalcemia

Also please note that unless Vitamin D, 1, 25-Dihydroxy is specifically requested, (for example, if only Vitamin D is requested), a Vitamin D, 25-Hydroxy, Total will be performed. 

Specimen Draw blood in a plain, red-top tube or serum gel tube, from a fasting patient (4 hour fast preferred) Spin down and send 1.5 mL (minimum: 1.2 mL) of serum refrigerated in a screw-capped, plastic vial. 
Reference Values Pediatrics <16: 24 - 86 pg/mL
Males > or = 16 years: 18 - 64 pg/mL
Females > or = 16 years: 18 - 78 pg/mL

NOTE: Reference values were determined in the wintertime in Rochester, MN. Normal patients who have increased exposure to sunlight may have values above this normal range. 

Analytic Time 2 Days 
Day(s) Test Set Up Monday through Friday 
CPT Code(s) 82652