to determine if propylthiouracil ( ptu ) inhibited extrathyroidal thyroxine ( t4 ) to triiodothyronine ( t3 ) conversion in man , ptu was administered to t4-treated hypothyroid patients and serial measurements of t4 , t3 , and thyrotropin ( tsh ) carried out .
C0040165
thyroxine
C0020676
hypothyroid