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A 68-year-old woman presents to your clinic to establish care after 20 years without a clinician. Her only complaint is mild fatigue that has been occurring for a year or more. A thorough history reveals no significant past medical conditions and a family history that is remarkable for coronary heart disease (father) and stomach cancer (brother). A comprehensive physical examination is unremarkable. Basic screening laboratory tests are ordered, including a thyroid-stimulating hormone (TSH) level, which returns elevated at 9.2 mU/L. The patient returns to the clinic for a free thyroxine (T4) value, which is found to be within normal limits. She is diagnosed with subclinical hypothyroidism. Should she be started on levothyroxine therapy?