TPO and hyperthyroidism: Her thyroid function tests (Table 2) revealed hyperthyroidism with a fT3 level of 11.58 pmol/L (3.8-6.0 pmol/L), fT4 28.98 pmol/L (12-22 pmol/L), TSH 0.02 μIU/mL (0.34-5.6 μIU/mL), anti-TPO antibody 7 IU/mL (0-9 IU/mL), anti-TSH receptor antibody <1 IU/L (<1 IU/L), and anti-thyroglobulin antibody <0.9 IU/mL (0-4 IU/mL).