Test Name
1,25-DIHYDROXYVITAMIN D
Aliases
CALCITRIOL; 1,25(OH)2 VITAMIN D; 1,25 DIHYDROXY CHOLECALCIFEROL
Abbreviations
VIT D 1,25
Test Classification
INDIVIDUAL
Department
SPECIAL CHEMISTRY
Sub Department
-
TAT Category
ELAPSED (CONTINUOUS) TIME
Estimated TAT
168
TAT Units
HOURS
Test Requirements
Serum in plain tube (red top) or SST tube (yellow top) or in a separation vial. Centrifuge tubes within 1 hour. Separate centrifuged serum in plain tubes within 1 hour.
When the order simply states vitamin D, select 25-hydroxyvitamin D (C1014) instead of 1,25 dihydroxyvitamin D (C1015).
SHIPPING/ TRANSPORTATION REQUIREMENTS
Shipping Temperature: Refrigerated
ANALYTE STABILITY
Room Temperature: 3 DAYS at 20-25°C │ Refrigerated: 7 DAYS at 2-8°C │ Frozen: 3 MONTHS at -20°C
Clinical Utility
This test measures the bioactive form of vitamin D. It is used in the differential diagnosis of hypocalcemia and to monitor patients with renal osteodystrophy or chronic renal failure.
Last Review
26th Feb 2026