Types of Dialysis: Hemodialysis vs Peritoneal Dialysis

Dialysis does the work your kidneys can no longer manage: it removes extra fluid and waste, and it helps keep minerals such as potassium in a safer range. There are two main types, and they reach the same goal in different ways. Both types also require attention to what you eat and drink, including how much potassium, sodium, and fluid you take in.

Hemodialysis cleans your blood through a machine. Blood leaves your body through a small tube, passes through a filter in the machine, and returns to you cleaned. It is usually done three times a week in sessions of about 4 hours at a dialysis center, though some people do it at home in shorter, more frequent sessions.

Peritoneal dialysis uses the lining of your belly, called the peritoneum, as a natural filter. Dialysis fluid fills your belly through a soft tube, stays there for a while, and then drains out with waste and extra fluid. You refill it several times a day, or a machine does the exchanges for you overnight while you sleep.

Give yourself time. If your kidney function is going down slowly, you can learn about both types months before you need to start. Your care team can refer you to a dietitian and a dialysis educator, who walk you through the practical details of each option.

Questions worth asking your team:

• Which type fits my other health conditions, such as heart failure or diabetes?

• What access would I need for each type, and how long does each one take to be ready?

• What does a typical week look like for each type, for me and for the person who helps me?

• How well is my home set up for home treatments, if I choose one?

• Who do I call at night or on weekends if something goes wrong during treatment?

What if you need to start urgently? If kidney failure comes on quickly, the team usually places a short-term tube in your neck or chest so hemodialysis can start right away. That first choice does not lock you in. Once you are stable and have time to decide, you can still plan a fistula or a peritoneal tube and move to the option that suits you.

In-center hemodialysis: You travel to a dialysis center three times a week. A care team runs the machine, and each session takes about 4 hours. Many people feel tired for a few hours afterwards. Between sessions, fluid and waste build up, so you follow limits on how much you drink and eat, including salty foods. Most people also take medicines to control potassium, phosphorus, and blood pressure.

Home hemodialysis: You and a partner train for several weeks, then run shorter sessions more often, such as 3 to 6 days a week. More frequent sessions put less strain on your heart and often come with fewer diet limits, but they need space for supplies and a trained helper for many programs.

Peritoneal dialysis: You do exchanges yourself during the day, or a machine called a cycler does them overnight. No needles. You keep more control over your schedule, and many people keep working or studying. You still follow fluid and diet guidance, and you do a daily check for signs of infection at the tube site and in the drained fluid. Your team will also ask you to track your weight, blood pressure, and how the drained fluid looks.

Hemodialysis: Sessions remove fluid over 4 hours, and that pace can cause tiredness, cramps, headaches, or low blood pressure during or after treatment. These effects often improve as your team adjusts your target weight and session length. The needle spots are sore at first; holding firm pressure after needles come out prevents bruising. Many people notice their taste for food returns and their energy climbs over the first month.

Peritoneal dialysis: The first exchanges may feel odd or mildly uncomfortable, and the fluid can give you a sense of fullness. Drain pain at the end of an exchange is common but should fade; your team can adjust how you fill and drain. The fluid contains sugar (glucose), so it adds calories and can raise your blood sugar if you have diabetes; your team may adjust your diabetes plan. Some people notice weight gain from the fluid's sugar content over time.

Both: It is normal to feel anxious before the first treatments. Energy, appetite, and sleep usually improve over the first weeks as your body adjusts. If tiredness does not improve, say so; your prescription can often be tuned. Keep a simple log of how you feel after each treatment for the first two weeks; it gives your team useful patterns to work with. Asking for a social worker referral is routine, not a failure.

Do not skip a session because you feel fine. Waste and fluid keep building between treatments, and feeling well does not mean you are in a safe range. If you feel sick on a treatment day, call the center; they would rather reschedule than have you come in unwell. If you miss a session, call your center the same day to reschedule it as close as possible.

With peritoneal dialysis, if you cannot do an exchange on time, do it as soon as you can and tell your team if you miss more than one. If your cycler alarms all night or your drains keep failing, do not keep retrying until morning; call the on-call peritoneal dialysis nurse. Keep some emergency supplies, such as spare transfer sets, at home and when you travel.

Power outages, severe weather, or evacuation plans: ask your center for its emergency plan and your backup center. Travel with peritoneal dialysis is common and workable with 4 to 6 weeks of planning with your team. For guest hemodialysis while traveling, book a chair at your destination at least 4 to 6 weeks ahead. For any big change, such as stopping or switching treatment, talk with your team first; these decisions are safe to make slowly, together.