 When an organ donor does arise, the transplant governing bodies must determine who receives the organ.The UNOS computer matching system finds a match for the organ based on a number of factors including blood type and other immune factors, size of the organ, medical urgency of the recipient, distance between donor and recipient, and time the recipient has been waiting on the waitlist.Because of the significant need for organs for transplantation, there is ethical debate around where the organs can be obtained from and whether some organs are obtained illegally or through coercion.