Leaders of Jehovah's Witnesses are revising their ban on receiving blood transfusions for religious reasons. They now allow members to decide whether to allow the collection and storage of their own blood in advance for future use. According to the official position of Jehovah's Witnesses, preoperative autologous blood collection is unacceptable, but autotransfusion techniques such as hemodilution, blood collection, extracorporeal circulation and hemodialysis are a matter of personal decision[2]. Jehovah's Witnesses reject the transfusion of allogeneic blood, including whole blood, red blood cells, white blood cells, platelets, and plasma, based on biblical passages[3]. They accept most medical procedures, including surgical methods and alternatives to transfusion[4]. Transplantation of bone marrow and stem cells from one's own blood is a matter of personal decision, if they are not associated with the collection and reinfusion of blood components[2]. For many, autologous blood management techniques such as blood collection and hemodilution are acceptable[2].