Review Question - QID 216266

A 30-year-old woman presents to the emergency department for palpitations. For 2 months, she has experienced intermittent palpitations along with menstrual irregularity and hair loss. At home, the air conditioner is at its coldest setting, but the patient still feels overheated. Her temperature is 99.5°F (37.5°C), blood pressure is 135/90 mmHg, pulse is 120/min, and respirations are 22/min. The patient is diaphoretic with tremulous hands, demonstrates thyromegaly, and protrusion of her eyes is noted. She is given atenolol in the emergency department with improvement of her palpitations and is instructed to follow up with her primary doctor for further management. Which of the following is most likely to be found in this patient after definitive treatment of her condition?