TG and metastatic malignant neoplasm in the lymph nodes: Rule 3 described 15 patients (34.90%) with recurrence and was defined as the sum of the following parameters: anti-thyroglobulin antibody level of 10to 15.4 IU/mL, number of central lymph node metastasis of 0 to 11 regardless of multiplicity, tumor size of 1.3 to 6.2 cm, 5-year thyroglobulin level of 0.1 to 2014 ng/mL, thyroglobulin after RAI of 31.2 to 5000 ng/mL, thyroglobulin level before RAI of 37.2 to 1186 ng/mL, and TSH after surgery of 0.03 to 10.88 mcIU/mL.