See hematologist: Dark or reddish-brown urine is often an early symptom of an Acute intermittent porphyria, a condition from abnormal breakdown of red blood cells from enzyme defect.It may be mistaken for hematuria [blood in the urine] The abnormal color is due to accumulation of pigments called porphyrins and/or porphobilin in the urine. The abnormal urine coloration may lessen or return to normal between attacks.
Answered 1/9/2020
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