Thyroxine dose: Was your TSH normal before, and now it is low? Over the years, your dose requirements for thyroxine can change, which is why a TSH should be checked periodically. Another possibility: the brand of thyroxine changed. Pharmacies sometimes switch people between different brands to save a few pennies, and there are difference in bioavailability which can affect tsh.
Answered 5/1/2015
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