A 32-year-old woman is seen for evaluation of thyroid nodules. At her visit, a 3 cm thyroid nodule was palpable on examination. She has no symptoms but was exposed to neck radiation at age of 20 for Hodgkin lymphoma. No family history of thyroid disease. The thyroid function test showed FT4 16 (12 - 22), TSH 0.9 (0.3 - 4.2). What is the next step?