A runner is in training for the Chicago Marathon.After his most recent 26 mile run, he notices that his urine is reddish-brown.By the next morning his urine is clear and yellow but he decides 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 occurs in athletes who engage in high intensity exercise or endurance training. It is caused by the breakdown of red blood cells, leading to the presence of hemoglobin in urine, which gives it a reddish-brown color. Hematology and chemistry results within reference range suggest there is no underlying health condition or renal damage. The fact that the urine cleared up the next morning is in line with this diagnosis as well. Dehydration or uric acid crystals would not result in dark, reddish-brown urine.

A Runner Is in Training for the Chicago Marathon