25-OH Vitamin, D 25-Hydroxy Vitamin D, 25-Hydroxycholecalciferol
Up to 24 hours
Competitive Immunoassay
This test should not be confused with 1,25 Dihydroxy Vitamin D Test Code 16425), which is the active form of Vitamin D and is only clinically indicated in patients with end stage renal disease.
Accredited NRL Laboratory
Daily
The clinical utility of vitamin D centers on regulating calcium and phosphorus homeostasis to maintain skeletal integrity and bone health. Its primary uses include preventing and treating rickets in children, osteomalacia in adults, and managing osteoporosis and hypoparathyroidism, ideally interpreted in conjunction with plasma calcium.
Serum or Plasma
1 mL
Serum Separator Tube (SST, Gold Top) Plain Tube (Red Top) Lithium-heparin Plasma (Green Top)
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
This test does not require any special collection or pre-analytical handling. Follow routine specimen collection protocols.
| Temperature | Period |
|---|---|
| Room Temperature | 8 hours at ambient temperature (15 to25°C) |
| Refrigerated | 4 days at 2 to 8°C |
| Frozen | 24 weeks at -20°C (as an aliquot, thaw only once) |