FYI at TUK there has been recently in Clinical Thyroidal journal a meta- analysis paper on the risk of bone fractures in subclinical hyperthyroidism i.e. TSH's < 0.1 unit with normal FT4. No FT3 mentioned or done. I quote from the paper what I think is the culminating but less than impressive outcome:
Although the HRs for subclinical hyperthyroidism and all outcomes are significantly positive, the absolute excess number of fractures is still relatively small (i.e., 1 excess hip fracture for every 1000 person-years).
OK there is an increased risk but how small! Would you take the risk? I think I know the answer.