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

Updated: Jun 01, 2020
  • Author: Mark Rosenbloom, MD, MBA; Chief Editor: Michael A Miller, MD  more...
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Perform urinalysis to rule out uricosuria. False-negative test results for glucosuria are possible. Also perform renal function tests.

Measure PT if the patient is taking warfarin (Coumadin), since vitamin C may interfere with this drug. Serum iron levels should also be measured, because vitamin C enhances iron absorption.

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