The presence in the urine of haemoglobin. Haemoglobin is mainly contained in red blood cells, but a small amount is free in the blood plasma. Excessive breakdown of red blood cells, which may be due to heavy exercise, cold weather, falciparum malaria, or haemolytic anaemia, increases the concentration of free haemoglobin in the plasma. The excess haemoglobin is excreted in the urine.


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