Process of Hb being released by intravascular haemolysis
- initially haemoglobin (Hb) forms complexes with haptoglobin and these are taken up by the reticulo-endothelial system
- once stores of haptoglobin are used up then the Hb is degraded to haem in the circulation and binds to haemopexin
- once stores of haemopexin are saturated then the haem binds to albumin to form methaemalbumin
- in severe haemolysis then the free Hb is filtered by the kidneys and appears in the urine as haemosiderin
- in massive haemolysis there is free haemoglobin in the urine.
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