A 32-year-old man has a 3-months history of nervousness, tre…
A 32-year-old man has a 3-months history of nervousness, tremors, palpitation, increased sweating and discomfort with heat. He had lost 15 lbs despite increase food intake. He also noted muscle weakness and easy fatigability with exercise to which he was ordinarily accustomed. His skin was warm and moist, speech is rapid, his gaze had a stare quality (shown below) , and his movements were hyperkinetic. He exhibited tremors and very rapid reflexes, and he was unable to rise without assistant from a squatting position. Which one the following test result would confirm his medical condition?