Q100
Single choice
A 70-year-old man with a 50 pack-year history of smoking presents with a 6-week history of intermittent, painless, gross hematuria and urinary frequency. There are no masses palpable on abdominal examination, and rectal examination is normal. Urinalysis confirms the presence of hematuria, and urine culture is negative.
The initial diagnostic evaluation does not reveal any abnormalities.
Which of the following is the best next step in the diagnostic workup?