TPO and hyperthyroidism: Later, on the follow-up at month 22, she had another hyperthyroidism attack with a fT3 7.13 pmol/L (3.8-6.0 pmol/L), fT4 23.23 pmol/L (12-22 pmol/L), TSH 0.07 μIU/mL (0.34-5.6 μIU/mL), and anti-TPO antibody 54.5 IU/mL (0-9 IU/mL).