Eli5- why if you have a blood disease can you not replace your blood?

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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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Anonymous 0 Comments

Because the factory that makes it is broken. If you replace their blood, exchange transfusion, that is a short term treatment for severe symptoms. But eventually that blood breaks down and is replaced by their own jacked up blood. A red blood cell lives for about 12 weeks.

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