A 50-year-old female asked:
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tsh 0.03 and ft4 14.1. was on 112 synthroid but dr increased to 125 after this lab came back? why increase? am i not already too low? menopausal

1 doctor answer
Dr. John Berryman
53 years experience Obstetrics and Gynecology
TSH/Free T4: Low TSH (thyroid stimulating hormone) means decreased production of T3, which is converted to T4. "Free T4" is the amount of T4 which is in the circulation. Synthroid is T4 which is given to increase the amount of thyroid hormone which regulates metabolism. If your physician increased your Synthroid, it was b/c the value was too low of Free T4 in the reference range of the lab.
Answered on Apr 26, 2018
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