A 60-year-old white woman presents for an office visit. Her mother recently broke her hip, and the patient is concerned about her own risk for osteoporosis. She weighs 165 lb and is 5 ft 6 in tall. She has a 50-pack-year history of tobacco use. Medications include a multivitamin and levothyroxine 50 mg/d. Her exercise regimen includes mowing the lawn and taking care of the garden. She took hormone replacement therapy for 6 years after menopause, which occurred at age 49. Which recommendation for osteoporosis screening is most appropriate for this patient?