system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A 43-year-old man comes to the physician for a follow-up examination. Four months ago, he was treated conservatively for ureteric colic. He has noticed during micturition that his urine is reddish-brown initially and then clears by the end of the stream. He has no dysuria. He has hypertension. His only medication is hydrochlorothiazide. He appears healthy and well-nourished. His temperature is 37°C (98.6°F), pulse is 80/min, and blood pressure is 122/86 mm Hg. Physical examination shows no abnormalities. Laboratory studies show:
Hemoglobin 14.1 g/dL
Serum
Glucose 88 mg/dL
Creatinine 0.6 mg/dL
Urine
Blood 2+
Protein negative
Leukocyte esterase negative
Nitrite negative
RBCs 5–7/hpf
WBCs 0–1/hpf
RBC casts none
Which of the following is the most likely origin of this patient's hematuria?"
assistant
Urethra