<unk> , also known as<unk>  concentrate, is used to prevent or treat bleeding in people with either a low<unk>  count or poor<unk>  function. Often this occurs in people receiving cancer chemotherapy. Preventive transfusion is often done in those with<unk>  levels of less than 10 x 109/L. In those who are bleeding transfusion is usually carried out at less than 50 x 109/L. Blood group matching (ABO, RhD) is typically recommended before<unk> s are given. Unmatched<unk> s, however, are often used due to the unavailability of matched<unk> s. They are given by injection into a vein. Side effects can include allergic reactions such as anaphylaxis, infection, and lung injury. Bacterial infections are relatively more common with<unk> s as they are stored at warmer temperatures.<unk> s can be produced either from whole blood or by apheresis. They keep for up to five to seven days.<unk> s came into medical use in the 1950s and 1960s. It is on the World Health Organization's List of Essential Medicines. Some versions of<unk> s have had the white blood cells partially removed or been gamma irradiated which have specific benefits for certain populations.
Platelet transfusion
Plateletpheresis
Cryoprecipitate
Granulocyte transfusion
Exchange transfusion
Transfusion therapy 
Autologous blood therapy
Plasma coblation