Which lab studies are used in the diagnosis of vitamin D toxicity?

Updated: Jun 01, 2020
  • Author: Mark Rosenbloom, MD, MBA; Chief Editor: Michael A Miller, MD  more...
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Obtaining calcium levels is mandatory; they are usually above 11 mg/dL but may be much higher. Phosphate levels may increase with calcium.

Renal function tests (ie, blood urea nitrogen [BUN] and creatine tests, as well as urinalysis) are necessary to rule out possible kidney damage from hypercalciuria.

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