Neither hemodialysis nor peritoneal dialysis is universally better. Long-term survival rates are similar between the two, and the right choice depends on your lifestyle, body, and medical history. What does differ, sometimes significantly, is how each type fits into your daily routine, what you eat, how often you travel, and what it costs.
How Each Type Works
Hemodialysis filters your blood through a machine. Blood leaves your body through a surgically created access point in your arm (or sometimes a catheter in your neck or chest), passes through a filter that removes waste and extra fluid, then returns to your body. Most people go to a dialysis clinic three to five times a week for sessions that typically last three to four hours each. A small number of patients do hemodialysis at home, though only about 1.6% of all dialysis patients in the U.S. use this option.
Peritoneal dialysis uses the lining of your abdomen as a natural filter. A permanent catheter in your belly lets you fill the abdominal cavity with a special fluid that draws waste out of your blood. After several hours, you drain the fluid and replace it with fresh solution. This happens daily, either manually throughout the day (you do four to five exchanges yourself) or overnight using a machine that cycles fluid while you sleep. About 8.2% of U.S. dialysis patients use peritoneal dialysis.
The vast majority of patients, nearly 58%, receive in-center hemodialysis. That gap isn’t because hemodialysis produces better outcomes. It largely reflects referral patterns, insurance logistics, and the fact that many patients aren’t offered a real choice.
Survival Is Similar
One of the biggest fears people have when choosing a dialysis type is picking the one with worse survival. The data here is reassuring. In comparative studies, hemodialysis patients had survival rates of 92.5% at one year, 81.1% at three years, and 44.8% at ten years. Peritoneal dialysis patients had survival rates of 95.5% at one year, 86.4% at three years, and 55.7% at eight years. Researchers found no statistically significant difference in long-term survival between the two groups.
What does affect survival is how well you stick with your treatment schedule, manage your diet, and control blood pressure. The modality itself matters less than consistency.
Preserving Your Remaining Kidney Function
Most people starting dialysis still have some natural kidney function left. Keeping that residual function as long as possible improves how you feel day to day and gives you more dietary freedom.
Peritoneal dialysis consistently preserves remaining kidney function longer than hemodialysis. But there’s a tradeoff: peritoneal dialysis also depends on that residual function more heavily. Your remaining kidneys can contribute up to 44% of your total waste clearance on peritoneal dialysis, compared to roughly 19% on hemodialysis. That means when residual function eventually declines (and it does for nearly everyone), peritoneal dialysis patients feel the loss more acutely and may need to switch modalities. For hemodialysis patients, residual kidney function is more of a bonus that provides extra comfort and dietary flexibility rather than something the treatment relies on.
Daily Life and Diet
Hemodialysis patients on a conventional in-center schedule face stricter dietary rules. Because waste and fluid build up between sessions, you’re typically advised to limit potassium to 2,000 to 3,000 milligrams per day. That means avoiding or limiting nuts, seeds, beans, lentils, potatoes, tomatoes, and bananas. Fluid restrictions between sessions can also be tight, sometimes as little as one liter per day. Phosphorus restrictions add another layer, cutting out many dairy products, processed foods, and some whole grains.
Peritoneal dialysis, because it runs daily, removes waste and fluid more continuously. This generally allows a more relaxed diet with fewer potassium and fluid restrictions. Many peritoneal dialysis patients eat a wider variety of fruits and vegetables and drink more freely, which is a meaningful quality-of-life advantage for people who find strict diets difficult to maintain.
Quality of Life Differences
Research comparing patient-reported quality of life shows mixed results, with neither modality winning across the board. Home hemodialysis patients report significantly better general health and feel less burdened by kidney disease compared to those going to a clinic. Peritoneal dialysis patients also tend to appreciate the independence and schedule flexibility of treating at home.
Sleep quality is one area where the results may surprise you. Several studies found that in-center hemodialysis patients actually reported better sleep than peritoneal dialysis patients. If you’re doing overnight automated peritoneal dialysis, the machine cycling fluid while you sleep can disrupt rest for some people. Energy and fatigue levels showed similar patterns, with some studies finding peritoneal dialysis patients reporting slightly worse fatigue scores.
Nocturnal home hemodialysis, where longer sessions run overnight at home, showed trends toward better energy levels compared to conventional home hemodialysis. It also delivers meaningful cardiovascular benefits: reduced heart muscle thickening, better blood pressure control, and for some patients, fewer blood pressure medications. These advantages come from the gentler, slower fluid removal that longer sessions allow.
Infection Risks
Each type carries a distinct infection risk. For peritoneal dialysis, the primary danger is peritonitis, an infection of the abdominal lining. It happens when bacteria enter through the catheter, often during an exchange. Peritonitis rates have dropped significantly over the years, but the risk of repeated infections is one of the main reasons people eventually switch from peritoneal dialysis to hemodialysis.
Hemodialysis carries its own infection risks, particularly for patients using a central venous catheter rather than a surgically created fistula in the arm. Catheter-related bloodstream infections remain a major cause of hospitalization and serious illness in hemodialysis patients. Having a well-functioning fistula dramatically lowers this risk, which is why nephrologists strongly prefer creating one well before dialysis starts.
Cost Differences
Hemodialysis costs more. Between 2008 and 2015, Medicare spent an average of about $108,656 per year on hemodialysis patients compared to $91,716 for peritoneal dialysis patients, a difference of roughly $17,000 per person per year. That 11% gap has held steady even as peritoneal dialysis use has grown. Since 2011, Medicare reimburses peritoneal dialysis at the same rate as in-center hemodialysis, and additional reimbursement for home dialysis training is available. Federal policy has increasingly pushed toward home-based options, with the 2019 Advancing American Kidney Health Initiative creating new incentives to encourage peritoneal dialysis use.
For patients, the practical cost difference depends on insurance, transportation to a clinic (which adds up fast at three to five visits per week), and whether a caregiver needs to take time off work. Home-based options, whether peritoneal dialysis or home hemodialysis, tend to reduce these indirect costs.
Who Can’t Do Peritoneal Dialysis
Not everyone is a candidate for peritoneal dialysis. Your abdomen needs to function as a clean, open space for the fluid exchanges, so several conditions can rule it out. These include prior complex abdominal surgery that left significant scarring, an uncorrectable hernia, active inflammatory bowel disease, active diverticulitis, a colostomy or ileostomy, morbid obesity, very large polycystic kidneys that take up abdominal space, and severe lung disease (because the fluid in your abdomen pushes up on the diaphragm). An abdominal aortic aneurysm or abdominal cancers can also make peritoneal dialysis unsafe.
Peritoneal dialysis also requires that you or a caregiver can reliably perform the daily exchanges with clean technique. If physical or cognitive limitations make that impossible and no helper is available, in-center hemodialysis may be the only practical option.
Choosing Based on Your Life
If you value independence, a flexible schedule, fewer dietary restrictions, and want to avoid clinic visits, peritoneal dialysis or home hemodialysis is worth serious consideration. If you prefer having medical professionals handle your treatment, don’t want the responsibility of a daily home routine, or have abdominal conditions that rule out peritoneal dialysis, in-center hemodialysis is a solid choice with equivalent survival.
Many people also use peritoneal dialysis as a first modality and transition to hemodialysis later if peritonitis becomes recurrent or residual kidney function drops enough to make peritoneal clearance inadequate. Starting with peritoneal dialysis preserves your blood vessels for future hemodialysis access and keeps your remaining kidney function longer, which is why some nephrologists recommend it as a first-line approach for eligible patients.