urinary system AE haemosiderinuria AE 10069395 https://en.wikipedia.org/wiki/Hemosiderinuria David Ameriguian, Oliver He hemosiderinuria A urinary system AE that is characterized by when hemoglobin is released from RBCs into the bloodstream in excess of the binding capacity of haptoglobin. It occurs with chronic introvascular hemolysis and is called "brown urine."