When should I stop taking biotin before a blood test? 8 hours
What blood tests does biotin interfere with? Most of the published research on biotin interference covers hormone tests, such as parathyroid hormone (PTH), thyroid stimulating hormone (TSH), T4 and T3 tests, as well as tests for troponin.
Can biotin skew lab results? Biotin also known as vitamin B7, in high doses, can interfere with accurate results of common lab tests, warns the FDA. Biotin is added to many dietary supplements, and has been found to skew lab test results, including tests used by ER doctors to diagnose heart attacks. The problem has led to at least one death.