Blood donation strictly for purpose of further fractionation of red cells, white cells, platelets or plasma for either allogeneic or autologous transfusion.[1][28] Transfusions of autologous blood part of a "current therapy".[3] Hemodilution, a modified technique in which equipment is arranged in a circuit that is constantly linked to the patient's circulatory system.[26] Intraoperative blood salvage (autologous) or cell-saver scavenging, a method of collecting blood that has spilled from the circulatory system, washing and re-infusing it.[26] Heart-Lung Machine, a method in which blood is diverted to an artificial heart-lung machine and directed back into the patient.[26] Dialysis, wherein blood circulates through a machine, is filtered and cleaned, then returned to the patient.[26] Epidural Blood Patch, consisting of a small amount of the patient's blood injected into the membrane surrounding the spinal cord.[26] Plasmapheresis, wherein blood is withdrawn and filtered, having the plasma removed and substituted, and returned to the patient.[26] Labeling or Tagging, blood is withdrawn, mixed with medicine, and then returned to the patient by transfusion.[26][29] Platelet Gel, blood is withdrawn and put into a solution rich in platelets and white blood cells.[26] Fractions from red blood cells: Hemoglobin, the oxygen-carrying component of red blood cells.