<unk>  is a form of<unk>  in which the number of red<unk>  cells in the<unk> stream is boosted in order to enhance athletic performance. Because such<unk>  cells carry oxygen from the lungs to the muscles, a higher concentration in the<unk>  can improve an athlete's aerobic capacity (VO2 max) and endurance.<unk>  can be achieved by making the body produce more red<unk>  cells itself using drugs, giving<unk>  transfusions either from another person or back to the same individual, or by using<unk>  substitutes. Many methods of<unk>  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<unk>  using a number of methods, typically by analysing<unk>  samples from the competitors.
Blood doping
Work accident
Trauma
Sports injury
Incidental medical findings
Doping in sport
Patient abuse
Cigarette Burns