Hyperthyroidism [levels of free T3, free T4, and thyroid stimulating hormone (TSH); 10.58 pg/mL, 2.70 ng/dL, and 0.01 μU/mL, respectively], and autoantibodies related to GD [anti-thyroid peroxidase antibody (anti-TPO Ab, 148.0 IU/mL), and TSH receptor antibody (TRAb, 8.3 IU/mL)] were identified (Fig. 3). Here, TPO is linked to hyperthyroidism.