TSHR and hyperthyroidism: Biochemical evaluation showed primary hyperthyroidism: TSH, 0.0045 μIU/mL (SI: 0.0045 μIU/mL) (reference, 0.20-4.50 μIU/mL [SI: 0.20-4.50 μIU/mL]); free triiodothyronine (FT3) 9.69 pg/mL (SI: 14.88 pmol/mL) (reference, 2.2-4.3 pg/mL [SI: 3.38-6.60 pmol/mL]); free thyroxine (FT4), 2.26 ng/dL (SI: 29.15 pmol/mL) (reference, 0.80-1.60 ng/dL [SI: 10.32-20.64 pmol/mL]); and anti-TSH receptor antibody (TRAb), 43.6 IU/L (SI: 43.6 IU/L) (reference, <2.0 IU/L [SI: <2.0 IU/L]); accordingly, thiamazole (MMI; 10 mg/day) was initiated at a prior facility.