Blood donation is a voluntary procedure where a person agrees to have blood drawn so it can be given to someone needing a transfusion. It is important because every three minutes someone needs a blood transfusion and one in ten hospital patients require one. To donate, a person must be in good health, weigh at least 50kg, and not have donated in the past 56 days. Light food should be taken before donation and those with recent infections or surgery should wait to donate. Blood is taken to help injured people, surgery patients, and those with diseases. Only 350-450ml of blood is taken and the body replaces it within 24 hours.