For patients living with advancing chronic kidney disease, the question of “when” dialysis becomes necessary often looms larger than almost anything else. It’s rarely a single, sudden moment, it’s usually a decision built from a combination of lab trends, symptoms, and conversation over time. This guide explains how that decision is actually made.
Symptoms and Clinical Context
Dialysis decisions aren’t based on a lab number in isolation. Doctors weigh your actual clinical picture, how you’re genuinely feeling and functioning, alongside your test results.
Symptoms that become increasingly relevant as kidney function declines:
- Persistent, significant fatigue beyond what’s explained by other factors
- Nausea, vomiting, or loss of appetite
- Swelling (oedema) that’s difficult to manage with medication alone
- Shortness of breath, particularly from fluid overload
- Confusion or difficulty concentrating (signs of uraemia)
- Persistent itching
- Metallic taste or reduced appetite affecting nutrition significantly
- Muscle cramps, particularly at night
The presence and severity of these symptoms, alongside your lab trends, shapes the timing conversation. Two patients with similar eGFR can have very different symptom burdens, and symptoms matter as much as the number itself.
Kidney Failure: The Clinical Threshold
Kidney failure, CKD Stage 5, generally refers to an eGFR below 15, though the decision to start dialysis isn’t automatically triggered at this exact number.
Dialysis is generally considered necessary when one or more of the following develop:
- Severe, symptomatic uraemia affecting quality of life or safety
- Dangerous, treatment-resistant fluid overload
- Life-threatening electrolyte imbalances, particularly high potassium
- Significant, persistent metabolic acidosis unresponsive to medical management
- Malnutrition related to advanced kidney failure that isn’t improving with other measures
Some patients with eGFR just above or below 15 may not need dialysis immediately if they remain relatively well and stable; others may need it sooner if symptoms or complications develop more aggressively. This is genuinely an individualised clinical judgement, not a fixed rule.
Dialysis Types
If dialysis does become necessary, there are two main approaches, each with different practical implications worth understanding in advance.
| Type | How It Works | General Considerations |
| Haemodialysis | Blood is filtered through a machine, typically at a dialysis centre, usually 3 times weekly for several hours each session | Requires regular centre visits; vascular access (fistula or catheter) needed |
| Peritoneal dialysis | Uses the lining of your own abdomen as a natural filter, with fluid exchanges done at home, often overnight using a machine | Greater independence and flexibility; requires training and ongoing self-management at home |
Neither option is universally “better”, the right choice depends on your lifestyle, home situation, other health conditions, and personal preference. This is a conversation worth having well before you’re in crisis, so you have time to understand both options properly.
Transplant as an Option
Kidney transplant, where suitable, is generally considered the treatment offering the best long-term quality of life and outcomes compared to ongoing dialysis, for eligible patients.
Key points about transplant:
- Can come from a living donor (often a family member) or a deceased donor
- Requires careful medical evaluation for suitability, including overall health and ability to tolerate immunosuppressive medication afterward
- Waiting times for deceased donor transplants can be significant, which is why early referral for evaluation matters
- Some patients receive a “pre-emptive” transplant before ever needing to start dialysis, if timing and donor availability align
If transplant might be a realistic option for you, raising this with your nephrologist early, rather than waiting until dialysis is imminent, allows more time for evaluation and planning.
Discussing Preferences Early
One of the most valuable things patients with progressing CKD can do is start these conversations well before a crisis point forces a rushed decision.
Worth discussing with your nephrologist and family, ideally well in advance:
- Which dialysis type, if needed, would best fit your lifestyle and home situation
- Whether transplant evaluation is appropriate to pursue now, even before dialysis becomes necessary
- Whether conservative (non-dialysis) management is something you’d want to understand as an option, particularly relevant for some older patients or those with significant other health burdens
- Practical matters like vascular access planning, which ideally happens weeks to months before haemodialysis actually starts, not in an emergency
Patients who’ve had these conversations early generally report feeling more in control of the process, rather than feeling decisions were made for them in an emergency.
What This Means for Timeline Planning
If your nephrologist indicates you’re approaching the stage where dialysis may become relevant in the coming months, this is typically when:
- Vascular access planning begins (for haemodialysis) or peritoneal dialysis catheter placement is considered
- Transplant evaluation, if not already underway, is initiated
- Education about dialysis types and what daily life looks like with each becomes more detailed
- Practical planning (work, family, logistics) can begin with real lead time
This planning window is valuable, and it’s part of why regular nephrology follow-up as CKD progresses matters so much, it isn’t just about monitoring numbers, it’s about having enough lead time to make informed, unhurried decisions.
Practical Preparation Before Dialysis Becomes Necessary
If your nephrologist indicates dialysis may become relevant in the coming months or years, a few practical steps taken early tend to make the eventual transition considerably smoother:
- Protecting arm veins (for potential haemodialysis access) by avoiding unnecessary blood draws or IV lines in one arm, if your doctor advises this
- Learning about both dialysis types in detail before you need to choose, rather than deciding under time pressure
- Discussing work and lifestyle implications with your employer or family early, if relevant to your planning
- Asking about transplant evaluation timing, since this process itself can take time to complete
- Understanding financial and insurance coverage for dialysis or transplant care in advance
Early preparation doesn’t mean dialysis is imminent, it simply means you won’t be making major decisions for the first time during a medical crisis.
Frequently Asked Questions
Is there an exact eGFR number that means I need dialysis immediately?
Not a single fixed number. Dialysis timing considers your eGFR trend together with symptoms and complications, which is why it’s an individualised decision.
Can I choose which type of dialysis I have?
In many cases, yes, based on suitability and your preferences. This is exactly why early discussion of both options with your nephrologist matters.
How much advance notice do I usually get before needing dialysis?
This varies by individual progression rate, but for most patients with regular monitoring, there’s typically meaningful lead time for planning, not a sudden emergency.
Is a kidney transplant possible before I ever need dialysis?
Yes, pre-emptive transplant is possible for some eligible patients if timing and donor availability align, which is why early evaluation can be valuable.
What if I decide I don’t want dialysis?
Conservative, non-dialysis management is a legitimate option some patients choose, particularly with significant other health burdens. This should be an informed, supported decision with your care team.
Does starting dialysis mean my situation has failed to improve?
No. For many patients, dialysis becomes medically necessary as part of the expected disease course, not a sign that earlier management wasn’t working.
Discuss Your Situation With Our Team
If you’re trying to understand your own kidney disease trajectory and what questions to raise with your nephrologist, request an assessment and bring your recent lab history. Learn more about chronic kidney disease at 23C Regen.