Laboratory: Clinical Biochemistry  (SENDOUTS)
Test Name:
VITAMIN D (25-HYDROXY) (< 1 YEAR OLD) - (S)
Test Code: VDY1
Clinical Information:
Effective August 17, 2026 this test is to be performed exclusively for children < 1 year of age. For patients older than 1 year of age, please see VITAMIN D (25-HYDROXY) - (S)
Collection Devices:
Preferred Device:
1 - Serum Tube(s), NO GEL - Full Tube Collection
Alternate Device:
1 - Microtainer(s) - Plain Serum, NO GEL (0.5 mL) to fill line
Serum gel tubes are acceptable.
Specimen Required:
Serum: 0.5 mL
Pediatric Serum: 0.5 mL

Special Processing: Aliquot, store and send refrigerated. Frozen samples are also acceptable.


Specimen Stability: Ambient: 7 days

                                  Refrigerated: 28 days

                                  Frozen: 30 days
Referral:

Specimen referred from HSC-MS5 to:


Mayo Clinic Laboratories

3050 Superior Dr. NW

Rochester, MN 55901

Phone: 800-533-1710


Test ID: 25HDN

Test Name: 25-Hydroxyvitamin D2 and D3, Serum
Requisition:
Reference Values:
Reference Intervals: See report


Method of Analysis: LC-MS/MS
Availability:
Within 2 Weeks
See Also:
More Information:
Interpretation and Assay Interferences: C-3 epimers of 25-OH-VitD2 and D3 are chromatographically separated and not included in the results.