nbmeanswers.com will be going offline for ~hour for some updates! we’ll be right back! --the webmaster (2:17am) ❤️
NBME 22 Answers
A 29-year-old woman comes to the physician because ...
Thyroid-stimulating hormone: decreased;
Free thyroxine: decreased;
Free triiodothyronine: increased
she doubled her triiodothyronine not levothyroxine, so she took a bunch of T3 -> feedback inhibition of TSH and therefore decreased T4
D’oh didn’t even read that just assumed it was levothyroxine. Thanks!
Exactly. I know there are papers saying there is some conversion of T3 to T4 but I try to keep it simple and think of it as once you break it apart (T4->T3), you cant put it back together. Only thyroglobin etc can put another I on it, so any T3 cant become T4 because you need it to be done in thyroid.