This is called auto-transfusion. The patient donates his or her own blood and that blood is transfused after the surgery. There are issues with that, including the fact that most insurances do not provide for that. And additionally, if you do not need that blood, that blood cannot be used for somebody else and it is thrown away. Additionally, now days, surgery is done in a very minimally invasive manner. We use a lot of techniques to decrease the blood loss, including use of tranexamic acid before and during the surgery.