Abstract: 【Abstract】Objective: To evaluate the clinical value of 131I of thyroidectomy dose in the metastases of the differentiated thyroid carcinoma patients who were cut off most part of thyroid. Method: Twenty three differentiated thyroid carcinoma patients who were suspected metastases, including 17 cases of papillary cancer, 6 cases of follicular cancer , all were cut off most part of thyroid before 4 months to 35 months, measured the thyroglobulin levels in the blood serum, took ultrasound or CT check, took 131I- WBS using diagnostic dose, then gave patients 131I of thyroidectomy dose, took 131I- WBS again after one week, compared the results with the previous results. Result: 23 cases of patients, with thyroglobulin levels arising in 20 cases, ultrasound found recurrence in 4 cases, CT found metastases in 15 cases, including lymph node of neck, lungs, skeletons and brain. 131I- WBS of diagnostic dose found abnormal uptakes in 5 cases of patients, including 4 positions in lymph node of neck,3 positions in the lungs, while, 131I- WBS of thyroidectomy dose found abnormal uptakes in 21 cases of patients, including 16 positions in lymph node of neck and mediastina, 8 positions in lungs, 5 positions in skeletons and 2 positions in brain.,Conclusion: The positive rates of 131I- WBS of thyroidectomy dose in differentiated thyroid carcinoma is obviously superior to that of diagnostic dose. 【Key words】thyroidectomy; 131-iodine; differentiated； thyroid carcinoma；metastases

Key words: thyroidectomy, 131-iodine, differentiated, thyroid carcinoma, metastases