Kidney transplants are the most common transplant operations, and are the best treatment option for an end-stage renal disease, in which kidney failure is so advanced that it cannot be reversed or treated with medications. The donor kidney has been chilling in an ice bath right before its preparation for transplantation. Interesting fact is that in many kidney transplants, the old kidney isn't removed. It is essentially disconnected and then pushed into a safe spot in the body, unless they are causing medical problems like high blood pressure, infections, or are too large to stay in the body.