An<unk>  is a blood transfusion in which the patient's blood or components of it are<unk> d with (replaced by) other blood or blood products. The patient's blood is removed and replaced by donated blood or blood components. This<unk>  can be performed manually or using a machine (apheresis). Most blood transfusions involve adding blood or blood products without removing any blood, these are also known as simple transfusions or top-up transfusions.<unk>  is used in the treatment of a number of diseases, including sickle-cell disease and hemolytic disease of the newborn. Partial<unk>  might be required for polycythemia. Nearly all<unk> s are allogeneic (that is, the new blood or blood products come from another person or persons, via donated blood); autologous<unk>  is possible (using autologous blood banking), but there are not many situations in which a need for it arises, as most autologous transfusions involve no<unk> .
Exchange transfusion
Platelet transfusion
Plasma coblation
Transfusion therapy 
Blood fractionation
Fresh frozen plasma
Granulocyte transfusion
Cryoprecipitate