| Test Name: | Vitamin D 25 - Hydroxy (25-OH) |
| Epic Order Code: | LAB535 | | |
| CPT Code: | 82306 |
| Specimen(s) Type: | Serum, 1.0 mL |
| Acceptable Container(s): |   Tube tops are gold and red. |
| Testing Schedule: | Batch testing; performed 2-3 times per week according to volume. |
| Turn Around Time: | STAT: NA |
| | Routine: 48-72 hours |
| Collection Information: | No special patient preparation is required. Obtain by standard collection procedures. |
| Transport Information: | Deliver to lab immediately. All specimens must be signed into the laboratory. |
| Reference Client: | If unable to deliver to the lab within 1 hour, centrifuge the specimen and remove serum from the red cells. Store and transport at 2-8° C within 4 days. If longer storage is required, store and transport at -20° C for up to 24 weeks. |
| Causes for Rejection: | Improperly labeled, incorrect container, contaminated, insufficient volume, incorrect/delay in transport, hemolysis. |
| Reference Range: | 20 - 100 ng/mL |
| Additional Information: | It is commonly agreed that Vitamin D 25-OH is the metabolite to determine the overall Vitamin D status as it is the major storage form of Vitamin D in the human body. The half life of circulating Vitamin D 25-OH is 2-3 weeks. |