TG and thyroid nodule: This study included 10 clinical and ultrasound characteristics (age, sex, nodule size, internal or surrounding blood flow signal, aspect ratio, solid, low echo, microcalcifications, morphology and nodule location) and 4 hematological indices (TSH, Tg, TgAb, and TPOAb) as potential predictors for positive FNAB in C-TIRADS 4 thyroid nodules.