<unk> , also known as<unk><unk> , are red blood<unk>  that have been separated for blood transfusion. The<unk><unk>  are typically used in anemia that is either causing symptoms or when the hemoglobin is less than usually 70–80 g/L (7–8 g/dL). In adults, one unit brings up hemoglobin levels by about 10 g/L (1 g/dL). Repeated transfusions may be required in people receiving cancer chemotherapy or who have hemoglobin disorders. Cross-matching is typically required before the blood is given. It is given by injection into a vein. Side effects include allergic reactions such as anaphylaxis, red blood<unk> breakdown, infection, volume overload, and lung injury. With current preparation methods, the risk of viral infections such as hepatitis C and HIV/AIDS are less than one in a million.<unk>  are produced from whole blood or by apheresis. They typically last for three to six weeks. The widespread use of<unk>  began in the 1960s. It is on the World Health Organization's List of Essential Medicines. A number of other versions also exist including whole blood, leukocyte reduced red blood<unk> , and washed red blood<unk> .
Packed red blood cells
Cryoprecipitate
Whole blood
Neohemocyte
Fresh frozen plasma
Washed red blood cells
Platelet transfusion
Platelet-rich plasma