The aim of this prospective study was to assess the efficacy of 131I various dose in thyroid remnant ablation after near-total thyroidectomy of well-differentiated thyroid carcinoma. Results: 112 patients were included in this study, group 1 with 36 patients and group 2 with 25 patients having TSH 30 U / ml were treated 30 mCi and 100 mCi, respectively.