When Is a Kidney Transplant Needed? Understanding the Right Time for Transplantation

A kidney transplant may be considered when the kidneys can no longer perform enough of their normal functions to keep the body healthy. This usually happens in advanced chronic kidney disease, when a person develops kidney failure and needs kidney replacement therapy.

However, there is an important distinction between needing a transplant and having the transplant immediately. Some people are evaluated for transplantation before dialysis begins, while others receive a transplant after spending time on dialysis.

The timing depends on kidney function, the progression of kidney disease, overall health, transplant eligibility, and whether a suitable donor is available. Learn more about the procedure in our Kidney Transplant Surgery guide.

When Does Kidney Disease Reach the Point of Transplantation?

Kidney transplantation is generally considered when chronic kidney disease progresses to kidney failure, also known as end-stage kidney disease (ESKD).

At this stage, the kidneys are no longer able to adequately remove waste and excess fluid or maintain the body's internal balance. Problems such as abnormal electrolyte levels, fluid overload, anaemia, high blood pressure, and the buildup of waste products can become increasingly difficult to manage.

Kidney failure is commonly associated with an estimated glomerular filtration rate (eGFR) below 15 mL/min/1.73 m², although the decision about kidney replacement therapy is not based on the eGFR number alone.

Does Everyone With Kidney Failure Need a Transplant?

Kidney failure generally requires some form of kidney replacement therapy to sustain life. The two main options are:

• Kidney transplantation – replacing kidney function with a healthy kidney from a living or deceased donor.
• Dialysis – using haemodialysis or peritoneal dialysis to perform some of the functions normally carried out by the kidneys.

A transplant is not automatically suitable for everyone with kidney failure. Before transplantation, a specialised team evaluates whether the operation and the lifelong treatment required afterward are appropriate for the individual. This assessment is important because transplantation is major surgery and requires lifelong medicines to prevent rejection of the transplanted kidney.

Why Is Transplant Evaluation Started Before Dialysis?

One of the most important points for people with advanced kidney disease is that they do not necessarily need to wait until dialysis begins before discussing transplantation.

For suitable patients, transplant evaluation can begin while kidney function is declining but before kidney failure requires dialysis. This is known as planning for a preemptive kidney transplant.

What Is a Preemptive Kidney Transplant?

A preemptive kidney transplant is performed before a person starts dialysis. This approach may be possible when kidney disease is progressing toward kidney failure and a suitable donor is available, particularly a living donor. It can allow the patient to receive a functioning kidney without first spending time on dialysis.

Not everyone with advanced kidney disease will be able to have a preemptive transplant. The timing of kidney failure, transplant evaluation, donor availability, medical suitability and transplant-centre processes all influence whether it is possible.

What Signs May Indicate That Kidney Failure Is Becoming Advanced?

Declining kidney function can occur gradually, and some people may have few symptoms even when kidney function is severely reduced. As kidney failure progresses, however, symptoms and complications can become more noticeable. Possible symptoms and problems include:

• Persistent tiredness or reduced energy
• Loss of appetite
• Nausea or vomiting
• Itching
• Swelling caused by fluid retention
• Shortness of breath related to fluid accumulation
• Changes in urination
• Difficulty controlling blood pressure
• Anaemia
• Abnormal potassium or acid levels
• Other complications caused by advanced kidney disease

These symptoms are not specific to kidney failure and can occur with other medical conditions. Kidney function is therefore assessed using blood and urine tests together with the person's clinical condition.

Is Dialysis Always Needed Before a Kidney Transplant?

No. A patient does not necessarily have to undergo dialysis before receiving a kidney transplant. If transplantation can be planned before dialysis is required, the patient may undergo a preemptive transplant. This is one reason why people with progressively declining kidney function may be referred for transplant evaluation before reaching the point where dialysis becomes necessary.

However, many patients do require dialysis before a suitable kidney becomes available. Being on dialysis does not mean that transplantation is no longer possible. Patients receiving either haemodialysis or peritoneal dialysis may still be evaluated for transplantation.

What Determines Whether Someone Can Receive a Kidney Transplant?

Reaching kidney failure is only one part of the decision. A transplant team needs to determine whether transplantation is medically appropriate and whether the patient can safely undergo the procedure and manage the treatment afterward. The evaluation may consider:

• Overall physical health
• Heart and blood vessel health
• Other significant medical conditions
• Current kidney function and the cause of kidney failure
• Previous surgeries and medical treatments
• Presence of active infection or other conditions that need treatment
• Ability to take and follow lifelong anti-rejection medicines
• Availability and suitability of a donor

What If a Living Donor Is Available?

A living donor can sometimes make it possible to plan a kidney transplant before dialysis begins. A potential living donor must undergo a separate medical and psychological evaluation to determine whether donating a kidney is safe and whether the donation is appropriate. 

Blood group, tissue compatibility, antibody testing, and other factors are assessed as part of the transplant process. If a potential donor is not compatible, this does not necessarily end the search for a transplant option. Depending on the transplant programme and circumstances, other donor pathways may be considered.

What Happens If There Is No Donor Yet?

A patient may still be evaluated for transplantation even when a living donor has not been identified. Depending on eligibility and the applicable transplant system, the patient may be considered for a deceased-donor kidney. 

The waiting period can vary considerably, and the timing of transplantation cannot always be predicted. This is another reason why starting the evaluation early can be useful. It allows potential medical or practical issues to be addressed while the patient and transplant team consider available options.

Can Kidney Transplantation Be Considered Before Kidney Failure?

The transplant itself is generally performed when kidney failure is sufficiently advanced to justify kidney replacement therapy. However, the evaluation and preparation process can begin earlier.

For people with progressive chronic kidney disease, this distinction is important. Waiting until dialysis is urgently required before discussing transplantation can leave less time for medical optimisation, donor evaluation, and transplant planning.

For this reason, people approaching advanced kidney failure may be referred for transplant assessment before they actually need dialysis.

What If Kidney Function Suddenly Gets Worse?

A sudden decline in kidney function is not the same as progressive chronic kidney failure. Acute kidney injury can cause kidney function to deteriorate over a short period. In some cases, temporary dialysis may be required while the kidneys recover. 

A kidney transplant is generally considered for irreversible, advanced kidney failure rather than a temporary episode of acute kidney injury. Doctors therefore need to establish whether kidney damage is chronic and irreversible before deciding that transplantation is appropriate.

The Bottom Line

A kidney transplant is considered when kidney disease has progressed to irreversible kidney failure and transplantation is an appropriate form of kidney replacement therapy. However, the transplant process should ideally be considered before dialysis becomes necessary when kidney function is steadily declining.

For suitable patients, early evaluation may allow a preemptive kidney transplant, meaning transplantation can take place before dialysis starts. If this is not possible, transplantation may still be performed after dialysis has begun.

The right time is therefore not determined by a single blood-test result. Kidney function, symptoms, disease progression, overall health, transplant suitability, donor availability, and the time needed for evaluation all play a role.

If chronic kidney disease is approaching advanced stages, discussing transplant evaluation early can help patients understand their options and prepare for kidney replacement therapy before kidney failure becomes an urgent situation.