A runner is in training for the Chicago Marathon. After his most recent 26 mile run, he notices that his urine was reddish-brown. The next morning, his urine is clear and yellow, but he decided to see his primary care physician. All of the hematology and chemistry results are within the reference range. What is the most likely reason for this scenario?

Question

Quizplus · Accepted Answer

Exercise-induced hemoglobinuria is a rare condition that occurs in endurance athletes, such as marathon runners, and is characterized by the presence of hemoglobin in the urine due to the breakdown of red blood cells during prolonged and intense exercise. While the hematology and chemistry results were normal, the reddish-brown color of the urine is a classic symptom of this condition. It is important for the runner to continue monitoring his symptoms and discussing them with his physician.

A Runner Is in Training for the Chicago Marathon