Blood donation may be a voluntary procedure which will help save the lives of others. There are several sorts of blood donation, which help meet different medical needs. many people need blood transfusions annually . Some may have blood during surgery. Others depend upon it after an accident or because they need a disease that needs blood components. Blood donation makes all of this possible. there's no substitute for human blood — all transfusions use blood from a donor. Blood donation is safe. New, sterile disposable equipment is employed for every donor, so there is no risk of contracting a bloodborne infection by donating blood. If you are a healthy adult, you'll usually donate a pint of blood without endangering your health. Within 24 hours of a blood donation, your body replaces the lost fluids. And after several weeks, your body replaces the lost red blood cells. To be eligible to donate blood , plasma or platelets, you want to be In healthiness and a minimum of 16 or 17 years old. this is often the foremost common sort of blood donation, during which you donate a few pint of blood . The blood is then separated into its components — red cells, plasma, platelets. During apheresis, you're attached to a machine which will collect and separate blood components, including red cells, plasma, platelets, and return unused components back to the donor. Platelet donation (plateletpheresis) , Double red cell donation, Plasma donation (plasmapheresis)