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

Updated: Jun 01, 2020
  • Author: Mark Rosenbloom, MD, MBA; Chief Editor: Michael A Miller, MD  more...
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Measure PT, activated partial thromboplastin time (aPTT), and bleeding times, especially if any evidence of bruising or bleeding is present. Platelet aggregation studies may be performed if bleeding time results are abnormal.

Monitor PT in patients who are taking anticoagulants concurrently with vitamin E or in patients suggested to have vitamin K deficiency while taking vitamin E, because the PT may be elevated.

The plasma concentration of alpha tocopherol (normal, 6-14 mcg/mL) can be measured to confirm that high levels of vitamin E are in the blood.

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