The presence of free HEMOGLOBIN in the URINE, indicating hemolysis of ERYTHROCYTES within the vascular system. After saturating the hemoglobin-binding proteins (HAPTOGLOBINS), free hemoglobin begins to appear in the urine. [MeSH]
Haemoglobin uria | Haemoglobinuria | Haemoglobinuria due to haemolysis from external causes | Hemoglobinuria | Hemoglobinuria due to hemolysis from external causes