Initial evaluation of low serum 25-hydroxyvitamin D*

This algorithm is intended for use with additional UpToDate content on vitamin D.

25(OH)D: 25-hydroxyvitamin D; PTH: parathyroid hormone; BUN: blood urea nitrogen; tTG: tissue transglutaminase antibodies.

* The optimal 25(OH)D is controversial. The lower limit of normal is approximately 20 ng/mL (50 nmol/L).

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