A renal transplant is a surgery that replaces a failing kidney with a healthy one from a donor. It is the preferred treatment for end-stage kidney disease, offering both longer survival and better quality of life than staying on dialysis. On average, people who receive a kidney transplant gain a projected 10-year survival benefit over those who remain on dialysis long term.
Why a Kidney Transplant Is Needed
Your kidneys filter waste and excess fluid from your blood. When they lose enough function that they can no longer sustain life on their own, the condition is called end-stage kidney disease. At that point, you need either dialysis or a transplant to survive.
Guidelines recommend that patients begin preparing for transplant or dialysis once their estimated kidney filtration rate drops below 30 milliliters per minute, roughly 30% of normal function. The actual transplant typically becomes the goal once filtration falls to 15 to 20 milliliters per minute or lower. Some patients receive a transplant before ever starting dialysis, which is called a preemptive transplant and tends to produce better outcomes.
Living vs. Deceased Donors
A transplanted kidney comes from one of two sources: a living donor or a deceased donor. Living donors are usually family members, friends, or even altruistic strangers who volunteer a kidney. Deceased donor kidneys come from people who have died, either from brain death or cardiac death, and whose organs are recovered for transplant.
Kidneys from living donors consistently perform better. For transplants done between 2016 and 2018, five-year graft survival was 93.1% with a living donor compared to 86.9% with a deceased donor. Living donor recipients also tend to have better kidney function at the one-year mark and shorter wait times, since they bypass the national waiting list entirely.
Most people waiting for a deceased donor kidney in the United States wait three to five years on the national transplant list, though your actual wait could be shorter or longer depending on blood type, antibody levels, and geographic region.
Who Can Be a Living Donor
Living donors must be at least 18 years old, though some transplant centers require donors to be 21. Beyond age, the evaluation is thorough. Potential donors go through a full physical exam, lab work, cancer screenings, a mental health evaluation, and a detailed review of their medical and social history. The goal is to confirm that donating a kidney won’t put the donor’s own long-term health at serious risk.
Donors also discuss their financial situation and ability to take time off work, since recovery requires several weeks away from normal activity. The process is designed to ensure the decision is fully informed and voluntary.
What Happens During Surgery
The transplanted kidney is not placed where your original kidneys sit. Instead, the surgeon positions it in your lower abdomen, usually on the right or left side. This location makes it easier to connect the new kidney’s blood vessels to your own artery and vein, and to attach its ureter (the tube that carries urine) directly to your bladder.
In most cases, your original kidneys stay in your body. They’re only removed in rare situations, such as when polycystic kidney disease has caused them to become extremely enlarged. The surgery itself is a major operation performed under general anesthesia.
Recovery After Transplant
Most people spend about three days in the hospital after surgery. Once home, the recovery restrictions are specific and gradual. You can’t drive for six weeks. Heavy lifting and strenuous physical work are off limits for at least six to eight weeks, and for several months you’ll have weight limits: nothing over 20 pounds for the first two to three months, and nothing over 40 pounds for four to six months.
Walking and light activity can begin once your incision has healed, and most people gradually rebuild their strength over the first few months. Contact sports, however, are permanently discouraged because of the risk of injury to the transplanted kidney, which sits in a more exposed position than your natural kidneys.
Lifelong Anti-Rejection Medication
Your immune system treats a transplanted kidney as foreign tissue and will attack it unless suppressed. To prevent this, you’ll take immunosuppressive medications for as long as you have the transplant. These drugs dial down your immune response so your body tolerates the new organ.
The standard regimen combines drugs from different classes. Some block immune cells from activating in the first place, while others prevent those cells from multiplying. The tradeoff is that a suppressed immune system makes you more vulnerable to infections, so transplant recipients need to be vigilant about illness prevention and keep up with regular medical monitoring throughout their lives.
Risks and Complications
Like any major surgery, a kidney transplant carries risks. Complications fall into two broad categories: surgical and medical.
Surgical complications affect roughly 13% of recipients in the early period after transplant. The most common include wound infections, blood clots, bleeding, and injuries to the ureter or blood vessels. Narrowing of the transplanted kidney’s artery is the most frequent vascular complication, occurring in 3% to 23% of transplants within the first year. Urological problems, such as blockages in the ureter connecting the kidney to the bladder, are the most common late surgical complications, affecting 2.5% to 12.5% of recipients.
On the medical side, rejection is the central concern. Early graft failure (within the first six months) is most often caused by acute rejection, technical problems during surgery, or receiving a kidney that wasn’t viable. Long-term graft loss is more commonly caused by chronic kidney disease developing in the transplanted organ or by the recipient dying from an unrelated cause while the kidney is still functioning. Infections and cardiovascular events are also significant risks, partly driven by the immunosuppressive medications themselves.
How Long a Transplanted Kidney Lasts
Transplant outcomes have improved substantially over the past few decades. For adults aged 18 to 34 who received a transplant between 2016 and 2018, one-year graft survival was 99.1% with a living donor and 97.6% with a deceased donor. At five years, those numbers were 93.1% and 86.9%, respectively.
Older recipients see somewhat lower rates but still benefit significantly. For those 65 and older, five-year graft survival was 80.2% with a living donor and 66.1% with a deceased donor. Age, donor type, time spent on dialysis before transplant, and how well your body matches the donor kidney all influence how long the transplant lasts.