A 42-year-old woman is evaluated for an asymmetric enlargement of her thyroid. She is otherwise asymptomatic, and she has no risk factor for thyroid cancer. On examination, a possible thyroid nodule is palpated on the left side. A CBC, routine serum chemistry tests, and TSH are normal, US reveals a 2.2 cm left sided solid nodule. What is the appropriate next step in the evaluation of this patient?