Like if you have sickle cell or blood cancer or things can you not just like use a dialysis machine to take out your sick blood and do new clean blood?
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Exchange transfusions are used for severe sickle cell crises. But it’s not practical to do them all the time and they come with risks.
Bone marrow transplants from a donor are incredibly dangerous and require taking drugs to suppress the immune system which cause many problems.
There is a cure for sickle cell, it involves gene editing to allow for production of normal hemoglobin. It is safe and effective but currently is very expensive. Its one of if not the most expensive therapy in existence right now (with a cost >$1 million per person to cure).
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