Group A : preparation by L-T ( 4 ) withdrawal ( 37 days ) ; 21 patients received ( 131 ) I ( 2.02 + / -0.22 GBq ; 54.6 + / -5.9 mCi ) and on the day of treatment , TSH , Tg , TgAb were measured ; Group B : stimulation by rhTSH ; 21 patients received ( 131 ) I ( 1.97 + / -0.18 GBq ; 53.2 + / -4.9 mCi ) 24 h after the second injection of rhTSH ( 0.9 mg ) and TSH , Tg and TgAb were measured after 2 days .
