A kidney transplant is a surgical procedure to place a healthy kidney from a living or deceased donor into a person whose kidneys no longer function properly. Patients with end-stage renal failure are candidates for transplantation. A successful transplant frees the patient from dialysis and provides the kidney's other metabolic functions. The survival rate a year after a transplant from a living related donor is over 95%. The survival rate a year after a transplant from a cadaver is about 90%. The principal problems in kidney transplantation involve avoiding rejection of the transplanted kidney by the recipient's immune system.