TSH is a pituitary hormone and can fluctuate for a variety of reasons.
Many/most of us feel best with FT4 about mid range and FT3 in the upper 1.3 of its range. Your FT4 is much higher than that, but without an FT3, we don't know what's going on.
Thyroid antibodies can cause symptoms without affecting TSH, free T4, or free T3. Other labs to check out include free T3, thyroid peroxidase antibody (TPOAb), thyroglobulin antibody (TgAb), reverse T3 (high levels blocks the action of free T3).
The mineral selenium is an antioxidant, helps regulate thyroid function, helps the immune system, may play a role in preventing cancer and heart disease, and detoxifies mercury. Brazil nuts are the highest source of selenium.
T4 Free range pmol/L
normal max 9 - 23
normal min 12-18
People often seem to say your FreeT4 should be in the high end to feel normal which mine is.
Is it possible my normal Free T4 before I got ill might have been even higher ? ie I might need a FreeT4 of 25 and my thyroid is failing and ONLY producing 22.