Blood doping

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Blood doping is a form of doping in which the number of red blood cells in the bloodstream is boosted in order to enhance athletic performance. Because such blood cells carry oxygen from the lungs to the muscles, a higher concentration in the blood can improve an athlete's aerobic capacity (VO₂ max) and endurance.^[1] Blood doping can be achieved by making the body produce more red blood cells itself using drugs, giving blood transfusions either from another person or back to the same individual, or by using blood substitutes.

Many methods of blood doping are illegal, particularly in professional sports where it is considered to give an artificial advantage to the competitor. Anti-doping agencies use tests to try to identify individuals who have been blood doping using a number of methods, typically by analyzing blood samples from the competitors.