Organs are allocated nationally based on a complex medical formula established by transplant doctors, public representatives, ethicists and organ recovery agencies. UNOS (the United Network for Organ Sharing) maintains the list of patients waiting for transplants. A donor’s blood type, tissue type, body weight, and size are matched against patients on the list. If there are multiple matches, priority is given to the sickest patients, or in the case of kidneys, those who have been on the waiting list the longest. Factors such as race, gender, age, income or celebrity status are never considered when determining who receives an organ.