In hemoglobinuria, oxyhemoglobin predominates in alkaline urine and gives it what color?

Question

Quizplus · Accepted Answer

In hemoglobinuria, the urine appears red due to the presence of oxyhemoglobin. This is because in alkaline urine, oxyhemoglobin is less stable and is converted into methemoglobin, which breaks down into hemoglobin and produces the red color. Purple or brown color may appear in acidic urine due to the conversion of oxyhemoglobin to sulfhemoglobin or acid methemoglobin, respectively. However, the question specifies alkaline urine, so these options are not correct.

In Hemoglobinuria, Oxyhemoglobin Predominates in Alkaline Urine and Gives It