How is it decided whether I need dialysis or transplant? 

The decision between dialysis and a kidney transplant is based on a comprehensive clinical assessment of your kidney function, your overall physical fitness, and your personal lifestyle goals. While a transplant is generally considered the most effective long-term treatment for kidney failure, not everyone is a suitable candidate for major surgery. Your renal team uses blood tests, heart scans, and surgical evaluations to determine which path is the safest and most beneficial for your specific health situation. 

A kidney transplant and dialysis are the two main forms of renal replacement therapy. In the UK, the NHS follows a ‘Shared Decision Making’ model, where medical evidence is combined with your personal preferences to create a treatment plan. This process usually begins when your kidney function (eGFR) drops below 15 to 20 per cent, giving you and your family time to prepare for the transition to these life-sustaining therapies. 

What We’ll Discuss in This Article 

• The role of the estimated Glomerular Filtration Rate (eGFR) in timing treatment 

• How surgical fitness and ‘biological age’ determine transplant eligibility 

• The difference between pre-emptive transplants and starting on dialysis 

• Clinical tests required to assess your heart and lung health for surgery 

• How lifestyle factors, such as work and home support, influence the choice 

• The role of the multi-disciplinary team (MDT) in making the final recommendation 

The clinical assessment of kidney function 

The primary driver for starting any renal replacement therapy is the measurement of your kidney function, specifically your eGFR. When your eGFR falls consistently below 15, your kidneys are considered to be in ‘failure’. At this point, your body can no longer effectively manage waste products and fluid balance. Your consultant will monitor these levels over several months to see how quickly your function is declining. 

If your kidney function is declining slowly and you have a willing living donor, the team may aim for a ‘pre-emptive’ transplant, which happens before you ever need dialysis. However, if your function drops suddenly or you do not have a donor ready, the decision is usually made to start dialysis first to keep you safe while the longer transplant assessment process takes place. 

Assessing surgical fitness for a transplant 

A kidney transplant is a major operation that requires a general anaesthetic and a lifelong commitment to anti-rejection medication. Therefore, the decision to recommend a transplant is based heavily on whether you are ‘surgically fit’. This does not mean you have to be perfectly healthy, but you must have a heart and respiratory system strong enough to withstand the stress of the procedure. 

The assessment process usually includes an echocardiogram (a heart ultrasound), an electrocardiogram (ECG), and sometimes a chest X-ray. Doctors also look for any active infections or untreated cancers, as the immunosuppressant drugs required after a transplant could make these conditions worse. If the risks of surgery are higher than the benefits of a new kidney, the team will recommend dialysis as the safer long-term option. 

Comparing the decision factors for treatment 

The following table outlines the key criteria that clinical teams use to differentiate between the two treatment paths: 

Decision Factor	Favours Dialysis	Favours Transplant
Surgical Risk	High (patient is too frail for surgery)	Low to Moderate (patient is fit for surgery)
Heart Health	Severe, unstable heart disease	Stable or healthy cardiovascular system
Living Donor	No living donor available	Compatible living donor available
Life Expectancy	Shorter (due to other illnesses)	Long (likely to benefit for 10+ years)
Patient Preference	Prefers no surgery or pills	Prefers independence and energy
Access Site	Good veins for fistula or catheter	Healthy abdominal area for surgery

Causes for choosing dialysis as the first step 

There are several reasons why a patient might start dialysis even if they eventually want a transplant. One common cause is that the patient’s health has deteriorated quickly, and they need immediate filtration to save their life. In these ‘acute’ cases, dialysis is the only immediate option while the patient is stabilised. 

Another cause is the time required for transplant preparation. The assessment process can take several months, and waiting for a deceased donor kidney in the UK takes an average of two to three years. Consequently, dialysis serves as a vital ‘bridge’ that keeps the patient healthy and cleans their blood while they wait for a suitable organ match to become available. 

Triggers for a transplant referral 

In the UK, the trigger for starting a transplant assessment is usually when your eGFR reaches 15 to 20. This is the point at which the renal team begins to look at your medical history in detail. A referral to the transplant surgeon is triggered if you are relatively fit and have expressed an interest in transplantation. 

If you have a potential living donor such as a relative or friend this acts as a major trigger to accelerate the process. The clinical team will begin testing the donor and the recipient simultaneously to see if a direct or paired match is possible. If at any point during your time on dialysis your health improves (for example, by losing weight or stopping smoking), this can also trigger a re-assessment for your transplant eligibility. 

Differentiation: Shared decision-making vs clinical necessity 

While clinical tests provide the data, the ‘shared decision’ involves your own life goals. Some patients choose dialysis because they feel more comfortable being monitored by nurses in a clinic three times a week. Others choose a transplant because they want to travel, return to full-time work, or have a more flexible diet. 

The medical team differentiates between what is medically possible and what is personally right for you. For example, a patient might be fit for a transplant but decide they do not want to take the lifelong immunosuppressant medications and their associated side effects. In the UK system, your voice is a central part of the final decision, provided the chosen path is clinically safe. 

My Final Conclusion 

The decision between dialysis and a transplant is a multi-step process that balances your kidney function results with your surgical fitness. While a transplant is often the preferred choice for long-term health, dialysis provides a safe and effective alternative for those who are not suited for surgery or who are waiting for a match. Your renal team will guide you through every test to ensure the final plan supports both your survival and your quality of life. 

If you experience severe, sudden, or worsening symptoms, such as extreme breathlessness, sudden confusion, or chest pain, call 999 immediately. 

Authority Snapshot 

This article was written by Dr. Rebecca Fernandez, a UK-trained physician with extensive experience in internal medicine, intensive care, and patient assessment. This guide outlines the clinical pathways and decision-making criteria used within the NHS for renal replacement therapy. The content is designed to empower patients with factual information regarding their treatment options while adhering to current UK medical standards.