Hi I'm underactive and have been for the last 4 years. Lately, my tsh has started to creep up a bit again, so GP has increased my dose to 125mcg levothyroxine. My latest result has come back as tsh 1.6 and t3 1.6. I'm afraid i don't know the range. The GP has left it up to me as to whether I want to increase my dose further, as she likes to see tsh at about 0.5. Just looking for some advice please? I'm still feeling very tired and sluggish, but don't want to end up being suppressed too much.