I’m not sure what your ”FT4” level is measuring. If that is your total T4 (or Total Thyroxine), normal range is approximately 4.5 to 12.5 (your level of 16.7 would be indicative of HYPERthyroidism). If you are saying it is Free T4, (or Free Thyroxine), normal range is approximately 0.7 to 2.0. It may be different in the US vs UK. Not sure. Your specific laboratory should have made a notation if the values are abnormal.
As for your TSH, 3.1 (if it is the same value as US) is actually creeping up to the high side. Over here, the American Academy of Endocrinologists changed their recommenda ...
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