A 25-year-old woman presents with a complaint of rapid weigh…

A 25-year-old woman presents with a complaint of rapid weight loss despite a voracious appetite. Physical examination reveals tachycardia (pulse rate 110 bpm at rest), fine moist skin, a symmetrically enlarged thyroid, mild bilateral quadriceps muscle weakness, and fine tremor. These findings strongly suggest hyperthyroidism. What laboratory tests should be ordered, and what results should be anticipated?