I will talk to the dr. about T3 level. Yes I have been on synthroid, about every dose possible. So this is why I am confused I cannot get my TSH levels to normal and stay there. Another round of RAI would make me even more hypo and my last two TSH levels were 48 and 21? This is discouraging. I am a pre-med major and so I can understand most all the medical talk. Thanks for any input. The last round of synthroid they calculated to my weight? Any ideas?