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.
Does biotin affect TSH levels? Most commonly, biotin use can result in falsely high levels of T4 and T3 and falsely low levels of TSH, leading to either a wrong diagnosis of hyperthyroidism or that the thyroid hormone dose is too high.