When do I need dialysis?

For many people with advanced kidney disease, dialysis is one of the biggest worries. Here’s what it actually is, the options, and how doctors decide when, or whether, it’s time.

What is dialysis?

Dialysis is a treatment that does some of the work your kidneys can no longer do, removing waste products and extra fluid from your blood, when kidney function has dropped very low. It doesn’t cure kidney disease, but it replaces enough kidney function to keep you well. There are two main types:

• Hemodialysis, which filters your blood through a machine, usually at a dialysis center or sometimes at home.
• Peritoneal dialysis, which uses the lining of your own abdomen to filter, and is typically done at home.

Dialysis is one option for kidney failure; a kidney transplant is the other, and for some people, especially those who are frail or elderly, a non-dialysis “conservative care” pathway focused on comfort and quality of life is also a valid choice.

When is dialysis needed?

Dialysis becomes relevant in Stage 5 kidney disease, kidney failure, generally when the eGFR falls below 15. But here’s what surprises many people: there is no single eGFR number that automatically means you need to start.

It’s based on symptoms, not just a number

Current guidelines recommend starting dialysis based on how you are doing, not on the eGFR alone. A large randomized trial found that starting dialysis early, at a higher eGFR, gave no survival advantage over waiting until symptoms developed. So doctors usually start dialysis when signs of kidney failure appear, such as nausea and poor appetite, fluid buildup that’s hard to control, or troublesome changes in blood chemistry. In practice, this often happens when the eGFR is somewhere around 5 to 10, but the symptoms are what guide the timing.

When it can’t wait

Some situations call for dialysis more urgently, for example, dangerously high potassium, severe fluid overload affecting breathing, or a severe buildup of acids or toxins that don’t respond to other treatment. Your nephrologist watches for these so they can act promptly if needed.

Planning ahead

The best outcomes come from preparing early. Working with a nephrologist well before dialysis might be needed gives you time to learn your options, choose the approach that fits your life, and avoid an unplanned, emergency start. Many people find that understanding the plan ahead of time makes the whole prospect far less frightening.

This article is for general education and is not a substitute for personalized medical advice. Talk with your doctor or nephrologist about your specific situation.