Doping refers to an athlete's attempt to increase their number of red blood cells by reinfusing some of their own blood (which has been stored) before an athletic event.

Blood doping refers to an athlete's attempt to increase their number of red blood cells by reinfusing some of their own blood before an athletic event. Doping is the action of using drugs to enhance performance or athletic ability. In sports it may be done through blood transfusions, injections of erythropoietin and also the injections of synthetic oxygen carriers.