There are two different types of donors – living and deceased.
A living donor, as mentioned above, may be a relative or someone unrelated to you. Either way, a kidney from this type of donor has the best likelihood of working the longest amount of time. A living donor must be in good health. Their evaluation will be as thorough as yours and will focus on whether or not donation of a kidney would do them any harm.
The second type of donor is a deceased donor, a person who has passed away and their family has granted permission for organ donation. To receive a deceased donor transplant you must be listed with UNOS (United Network of Organ Sharing). UNOS is a nonprofit organization that operates the Organ Procurement and Transplantation Network (OPTN) under contract from the federal government. The OPTN/UNOS continuously evaluates new advances and research and uses this new information to improve organ transplant policies to best serve patients waiting for transplantation.