
Hyperthyroidism
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The Different Causes of Hyperthyroidism
Many patients take biotin over the counter. Biotin does not actually alter thyroid hormone levels, but it can affect how TSH and free T4 are measured. One common medication that can affect thyroid hormone levels is amiodarone because it has a lot of iodine. In hyperthyroidism, we don't usually care too much about T3, but in this patient, I would also order a free T4 and total T3.
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