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A member asked:
Is possible to have both vitamin d tests drawn in one blood lab?
A doctor has provided 1 answer
Yes, 25-hydroxyvitamin D and 1,25-dihydroxyvitamin D levels can be assessed by laboratories. Although there are differences among Vitamin D methods, most laboratories utilize similar reference intervals. Because toxicity is rare, the focus has been on the lower limit and what cut-off for total 25-hydroxyvitamin D (D2 + D3) indicates deficiency [usually below 20 ng/mL (normal 30-50 nmol/liter)].
Answered 10/31/2021
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