1,25-Dihydroxy Vitamin D
Ordering Info & Methodology
Test Code
Cerner Synonyms
VITD
Calcitriol Vitamin D, 1,25 Dihydroxycholecalciferol, Vitamin D 1,25-Dihydroxycholecalciferol, 1,25 Dihydroxy Vitamin D, 1,25-Dihydroxycholecalciferol, 1,25-Dihydroxyvitamin D3, Calcitriol
Turn Around Time
Methodology
Analyzed within 30 days of receipt.
Liquid chromatography mass spectrometry
Ordering Guide
Specimen Requirements
Sample Type
Collection Container
Alternate Collection Containers
Serum without gel
Red
0.6 mL
7 days at room temperature, 2 months at -20ºC
Add on stability
This is the length of time after sample collection that this analyte is stable. Test can be added to a previously collected sample if the time since collection is less than the add on stability time.
Minimum Volume
Add On Stability
Collection and Shipping Requirements
Separate from cells and freeze. Send on ice pack.
Reference Intervals
Female Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
0 y - <19 y | Not Established | pmol/L |
≥ 19 y | 40-170 | pmol/L |
Male Reference Interval
Age Category | Reference Interval | units |
|---|---|---|
0 y - <19 y | Not Established | pmol/L |
≥ 19 y | 40-170 | pmol/L |
Additional Notes
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Measurement Uncertainty (MU)
Every laboratory value is an estimate of the true concentration of substance. MU is the 95% confidence interval around that estimate. 95% of the time, the true concentration will be within the range of the reported value ±MU. This value is based on analytical variability (precision) and does not reflect other factors such as sample collection and handling which may also affect the result.
Example
Reported sodium = 140 mmol/L
Sodium MU = 1%
Expanded uncertainty = 140 mmol/L ± 1% or 140mmol/L ± 1.4 mmol/L
Interpretation - the true value of sodium in the sample is in the range 138.6-141.4 mmol/L, with 95% confidence.
14%
Measurement Uncertainty
This is not standard 25-hydroxy vitamin D. This test should only be ordered for advanced investigation of abnormal calcium status. PTH, ionized calcium and 25-OH vitamin D should all be done prior to ordering this test.