VITAMIN D, 25-HYDROXY
| Synonyms: | 25-OH-DN/A |
| Computer Code: | (VITD) |
| Specimen Collection: | 3 mL blood (light green top (Li Heparin) preferred. Red/gold acceptable). |
| Minimum Volume: | 1.0 mL |
| Handling Instructions for Offsite Areas: | Allow to clot, centrifuge for 20 minutes, remove serum, freeze. Min 0.2 mL serum. |
| Reference Values: | <20 ng/ml = Deficiency 20 to <30 ng/ml = Mild Deficiency 30 - 100 ng/ml = Optimal >100 ng/ml = Possible Toxicity Note: Season, race and dietary intake are all known to affect the normal levels of 25-OH-D. 25-OH-D values correlate well with U.V. radiation exposure. Highest levels of 25-OH-D are found during the summer months and lowest levels during the winter. Race has also been shown to significantly influence the normal levels of 25-OH-D. It has been reported that the mean plasma level of 25-OH-D in whites is greater than in blacks. |
| Lab Code: | Chemistry |
| Requisition: | SPEC C |
| Test Frequency: | Daily |
| Routine TAT: | 4 hrs |
| Stat TAT: | 60 min |
| CPT Code(s): | 82306 |
| LCD or NCD: | LCD LCD LCD |
| Methodology Used: |
See Addendum XVII |