How Peritoneal Dialysis Exchanges Work: Fill, Dwell and Drain Explained in Plain Words

The first time most people watch an exchange, the surprise is how quiet it is. No needles, no humming machine the size of a refrigerator, no blood leaving the body. Just a bag of clear fluid hanging from a hook, a thin tube disappearing under a shirt, and a person reading a book while gravity does the work. Twenty minutes later the bag is full again, faintly yellow, and heavier than when it started.

That small scene is the whole idea. If you are learning how peritoneal dialysis exchanges work, whether for yourself or for someone you love, the mechanics matter less than the principle: your abdomen has a lining that can act as a filter, and a carefully designed fluid can coax waste out of your blood across it.

This explainer walks through fill, dwell and drain step by step, what the fluid is doing while it sits inside you, how many exchanges a typical day holds, and what to watch for. Decisions about your own treatment always sit with your kidney team.

How peritoneal dialysis exchanges work: what actually happens

Peritoneal dialysis (PD) is a kidney replacement treatment that happens inside your body rather than in a machine. The peritoneum is the thin, blood-rich membrane that lines your abdominal cavity and wraps around the organs inside it. Peritoneal dialysis borrows that membrane as a filter.

Before treatment begins, a surgeon places a soft, flexible tube called a PD catheter through the abdominal wall, usually a little below and to one side of the navel. Roughly half of it sits inside the cavity; the rest emerges through the skin at what nurses call the exit site. That catheter is the doorway for every exchange that follows.

An exchange has three movements. Fresh dialysis fluid, called dialysate, runs in through the catheter until the cavity holds the prescribed amount. The fluid stays there for a set number of hours. Then it is drained out into an empty bag, carrying waste and excess water with it, and the process starts again with a fresh bag.

While the fluid dwells, your blood keeps flowing through the tiny vessels in the peritoneum, a few cells’ width away from the dialysate. Urea, creatinine, potassium and other substances that failing kidneys can no longer clear move from blood, where they are concentrated, into fluid, where they are not. Water follows a sugar gradient in the same direction. The membrane never lets blood cells or large proteins through in any meaningful quantity, which is why the drained fluid looks like pale lemonade rather than anything alarming.

The NIDDK describes this as a continuous, round-the-clock form of dialysis: at almost any hour, there is fluid in the abdomen doing quiet work, which is one of the reasons people experience it differently from a hemodialysis session.

Peritoneal dialysis fill, dwell and drain: the three steps in plain words

Think of the fill as pouring, the dwell as steeping, and the drain as pouring out. Each has its own rhythm.

Fill. A bag of warmed dialysate is hung above the level of your abdomen. When you open the clamp, gravity pushes the fluid down the tubing and through the catheter. The NIDDK notes that the amount is typically about 2 to 3 quarts, though your team sets the exact volume for your body size and needs. Most people feel a sensation of fullness, a bit like after a large meal, rather than pain. The fill takes minutes.

Dwell. Once the bag is empty, you close the clamp, disconnect according to your training, cap the catheter and get on with your day. The fluid sits inside for the dwell time, which is where the actual cleaning happens. Dwells during the day are commonly measured in hours; an overnight dwell may last until morning. Nothing about the dwell requires you to stay still or lie down.

Drain. When the dwell is over, you connect again, lower an empty bag to the floor, and let gravity pull the used fluid out. Draining usually takes longer than filling because the fluid has spread through every corner of the cavity and has to find its way back to the catheter. You may notice a pulling sensation near the end. The drained volume is normally a little more than what went in; that difference is the extra water your body has shed.

The Cleveland Clinic and NHS both describe the same three-part loop, and nurses often summarize it as “drain first, then fill”, because a fresh exchange begins by emptying the previous dwell before new fluid goes in.

Why the peritoneum can work as a filter at all

The peritoneum was not designed for dialysis. It exists to let organs slide against each other and to carry a small amount of lubricating fluid. But it has two features that make it useful: a very large surface area, roughly comparable to your skin, and a dense network of capillaries sitting just beneath a single layer of cells.

Two physical processes do the work. Diffusion is the tendency of dissolved substances to spread from where they are concentrated to where they are scarce. Your blood arrives at the membrane loaded with urea and other wastes; the fresh dialysate contains almost none. Molecules drift across until the two sides come closer to balance. That is why the first hour or two of a dwell removes the most waste and why a fluid that has sat for a very long time eventually stops pulling much out.

Osmosis is the movement of water toward a higher concentration of dissolved particles. Dialysate contains a sugar-based agent, most commonly glucose, at a concentration higher than your blood. Water crosses from blood into the fluid to dilute it. This is how PD removes the extra liters that failing kidneys leave behind, a process the kidney literature calls ultrafiltration.

Small molecules such as potassium and urea cross easily. Medium-sized ones cross more slowly. Large proteins like albumin mostly stay in the blood, though a modest amount does leak into the fluid over a day, which is one reason PD dietitians often talk about protein intake.

The membrane behaves slightly differently from person to person. Some people transport solutes quickly and need shorter dwells; others transport slowly and do better with longer ones. A simple test called a peritoneal equilibration test measures this, and your prescription is built around the result.

What is in the dialysis fluid, and why do the bags come in different strengths?

A bag of dialysate looks like water and is mostly water. Dissolved in it are electrolytes in amounts close to a healthy person’s blood, a buffer that helps correct the acid build-up common in kidney failure, and the osmotic agent that draws out fluid.

The strength printed on the bag refers to the concentration of that osmotic agent, usually glucose. A weaker bag pulls off relatively little water; a stronger one pulls off more. Your team chooses which strengths you use and when, and may adjust them based on your weight, blood pressure and swelling. Because glucose is absorbed into the body during the dwell, stronger bags mean more absorbed sugar, which is relevant for people with diabetes and for anyone watching their weight. The Mayo Clinic lists weight gain from absorbed glucose among the recognized considerations of long-term PD.

Some prescriptions include a bag with a different osmotic agent, a large starch-based molecule, typically for the long overnight or daytime dwell. Because it is absorbed far more slowly than glucose, it keeps pulling water across the membrane for many hours. Whether and when such a solution is used is a clinical decision for your prescribing team, not a choice to make at home.

Fluid is usually warmed to body temperature before it goes in. Cold dialysate is safe but uncomfortable and can cause cramping. People are trained to warm bags with a heating pad designed for the purpose, never in a microwave, which heats unevenly and can create hot spots.

One habit worth building early: hold each bag up to the light before use and check for cloudiness, leaks or particles. A clear bag in and a clear bag out is the everyday sign that the system is working as intended.

How long does a PD exchange take, and how many exchanges in a day?

The honest answer is: the hands-on part is short, the dwell is long, and the pattern depends on which type of PD you do.

For manual exchanges, the NIDDK estimates that the drain-and-fill portion takes about 30 to 40 minutes. Draining is the slower half. People usually do this about four times across the day, with dwells of roughly 4 to 6 hours in between and a longer dwell overnight while they sleep. That pattern is called continuous ambulatory peritoneal dialysis, or CAPD, and the word “ambulatory” is the point: between exchanges you walk around with fluid inside you and nothing attached.

For automated exchanges, a bedside machine called a cycler does the filling and draining while you sleep. The NIDDK describes a typical overnight session lasting around 10 to 12 hours, with the cycler running several exchanges during that window. In the morning the machine may leave a final fill in place for a long daytime dwell, or the abdomen may be left empty, depending on your prescription. This is automated peritoneal dialysis, or APD.

These figures are typical ranges, not rules. Your team will fine-tune the number of exchanges, the dwell length and the fill volume after measuring how well your peritoneum transports waste and how much residual kidney function you still have. Someone whose kidneys still make a fair amount of urine may need fewer or shorter exchanges than someone whose kidneys make none.

What rarely changes is the arithmetic of the day. Roughly two hours of hands-on time spread across a CAPD day, or an evening set-up and a morning disconnection for APD, is the practical commitment most people describe, alongside the time spent ordering and storing supplies.

CAPD vs APD: manual daytime exchanges or an overnight cycler

Both types deliver the same fill, dwell and drain physiology. They differ in who does the work and when. Many people move between them over the years as their lives and their membranes change.

Feature	CAPD (manual)	APD (cycler)
Who moves the fluid	You, using gravity and hand-operated clamps	A bedside machine, programmed by your team
When exchanges happen	Spread through the day, typically about four	Mostly overnight, over roughly 10–12 hours
Hands-on time	About 30–40 minutes per exchange	Set-up in the evening, disconnection in the morning
Daytime	Fluid dwelling between exchanges	Often a long single dwell, or an empty abdomen
Equipment at home	Bags, tubing, a warmer, a stand or hook	All of the above plus the cycler and power supply
Travel	Bags can be carried or shipped ahead	Cycler is portable but bulkier; planning needed

Ranges in the table are those described by the NIDDK for typical schedules and are not promises about any individual prescription.

People who work or study during the day often find APD fits more naturally, because the daytime is largely free. People who dislike being attached to anything overnight, or who share a bedroom and worry about alarms, sometimes prefer the predictability of manual exchanges. Some prescriptions blend the two, adding one manual daytime exchange to an overnight cycler program when more clearance is needed.

Neither approach is medically superior across the board. The right one is the one your team judges will deliver adequate dialysis for your membrane type and that you can perform reliably and cleanly, day after day.

Who peritoneal dialysis is usually for, and who is usually asked to wait

PD is one of three main routes when kidneys fail: peritoneal dialysis, hemodialysis, or transplant, with conservative kidney management as a fourth path some people choose. The Mayo Clinic and NHS both describe PD as an option for many people with kidney failure who want to dialyze at home and can manage the routine themselves or with help.

It tends to suit people who value flexibility, who still have some residual kidney function, who have difficult veins that make hemodialysis access hard, or whose hearts tolerate slow continuous fluid removal better than the faster shifts of a hemodialysis session. Children are also often started on PD because it avoids needles and fits around school.

Some people are usually asked to wait or to consider another option first. The Mayo Clinic lists situations where PD may not be appropriate: extensive scarring inside the abdomen from previous surgery, a large untreated hernia, certain bowel conditions such as active inflammatory bowel disease, and severe obesity/">obesity that can limit how much fluid the cavity holds and how well waste is cleared. People unable to perform exchanges safely and without a trained helper at home may also be steered toward center-based hemodialysis.

“Asked to wait” often means exactly that. A hernia can be repaired. Weight can change. A helper can be trained. A catheter placed during a period of acute illness may be used once things settle. None of these are permanent verdicts, and reassessment is normal.

The choice is rarely made in a single appointment. Kidney teams typically discuss options months before dialysis is needed, precisely so a catheter can be placed and healed in time. The decision, and any later change of direction, rests with you and your treating team together.

Getting the catheter, healing, and the first weeks of training

The catheter is placed in a short operation, usually under general or local anesthesia depending on the technique and the person. Most people go home the same day or the next. The tube is anchored under the skin with small cuffs that tissue grows into, which is what eventually seals it against leaks and infection.

Then comes a pause. The NIDDK advises that the site typically needs about 2 to 3 weeks to heal before full exchanges begin, though teams sometimes use small volumes earlier if dialysis cannot wait. During this stretch the exit site is kept dry and covered, and swimming and baths are off the list.

Training follows, and it is thorough by design. Nurses teach the exchange sequence until it is automatic: washing hands, wearing a mask, preparing the surface, inspecting the bag, connecting without touching the sterile ends, running the drain and fill, and recording weights and volumes. The NIDDK describes this as taking roughly one to two weeks of sessions for most people, with additional time for cycler programming if you are doing APD. Partners or family members are often trained alongside.

You will also learn exit-site care, which becomes a daily habit like brushing your teeth. Expect to weigh yourself and check your blood pressure every morning, because those two numbers tell the team whether fluid removal is on target.

Deliveries of supplies begin around this time. A month’s worth of bags takes real space, often a closet or a corner of a spare room, and homes are usually assessed for storage, a clean area for exchanges, and reliable power if a cycler is planned. The early weeks feel like a lot. Most people describe the routine becoming second nature within a few months.

What day-to-day life on peritoneal dialysis often looks like

A CAPD day might run like this. Morning: drain the overnight fluid, weigh yourself, check blood pressure, fill, breakfast. Midday: exchange, perhaps during a lunch break in a clean room at work. Late afternoon: exchange again. Bedtime: a final fill that dwells until morning. Between those anchors, the day is your own.

An APD day is quieter. Set up the cycler in the evening, connect, sleep, disconnect in the morning, and rinse or dispose of the used tubing as trained. The machine records what it did and may flag a slow drain or a low volume for your team to review.

Eating on PD is often less restricted than on in-center hemodialysis, because clearance is continuous rather than three times a week. Potassium limits are frequently looser. Protein needs are typically higher, since some protein leaves with every drain. Fluid allowances vary with how much urine you still make and how much the exchanges remove. Salt matters for everyone, because thirst drives fluid intake and salt drives thirst. Your renal dietitian sets the specifics.

Body image comes up more than people expect. The catheter sits under clothing and is invisible to others, but you know it is there, and a full abdomen during a dwell changes how trousers fit. Many people find loose waistbands and a catheter belt helpful. Sexual activity is generally fine once the site has healed, with the catheter secured; this is a reasonable question to raise with your nurse, who has heard it many times.

Travel is possible with planning. Bags can be shipped ahead or carried; cyclers travel as medical equipment. Your team can advise on paperwork and on keeping the exchange routine clean in unfamiliar places.

Keeping exchanges clean: why technique matters more than speed

Every exchange opens a path between the outside world and the inside of your abdomen. The single most important thing you learn in training is how to keep that path sterile, because the most significant complication of PD is peritonitis, an infection of the peritoneal lining. The Mayo Clinic, NHS and NIDDK all identify it as the main risk of the treatment.

Peritonitis usually announces itself with cloudy drained fluid, abdominal pain and sometimes fever. It is treated with antibiotics, often given into the dialysis fluid itself so they act where the infection is. Most episodes respond, but repeated or severe infections can scar the membrane and are a leading reason people move from PD to hemodialysis. Prevention is therefore not a formality.

The routine is unglamorous and works precisely because it never varies. Hands are washed for a full minute and dried on a fresh towel. A mask is worn during connection and disconnection. The work surface is cleaned. Pets leave the room; windows and fans are off so nothing blows across the sterile ends. The connection is made without touching the tips, and if a tip does touch anything, the set is discarded rather than risked.

Exit-site care is the other half. The skin around the catheter is cleaned daily with the agent your team recommends and kept dry. Redness, crusting, tenderness or drainage at the site are reported early, because a site infection can track inward.

None of this needs to be rushed. Experienced patients often say the exchange takes as long as it takes, and the day they start hurrying is the day they start making mistakes. Speed saves minutes; technique saves the treatment.

Is there really a "rule of 4" in peritoneal dialysis, and is PD the most gentle dialysis?

Two questions turn up constantly in search boxes. Both deserve straight answers.

There is no formal “rule of 4” in kidney guidelines. The phrase seems to have grown out of the fact that a standard CAPD prescription involves about four exchanges a day, roughly four hours apart during waking hours, with fill volumes often in the range of about two liters, which some people round in their heads. Others use it as a memory aid for the four things they check at every exchange: the bag is clear, the drained fluid is clear, the volume out is at least the volume in, and the exit site looks healthy. Useful as a personal checklist, but not a clinical standard, and your own prescription may call for three exchanges or five. Follow your team’s plan rather than a number from a forum.

“Most gentle” is not a medical measurement either, but the question points at something real. Hemodialysis removes a few days’ worth of waste and fluid in a session of several hours, which can cause blood pressure drops, cramps and a washed-out feeling afterward. PD removes waste continuously and fluid slowly, so those swings are usually smaller. The NIDDK and Mayo Clinic both note that PD may be easier on the heart and blood vessels for this reason and may help preserve residual kidney function for longer.

That does not make it gentler for everyone. PD asks the body to carry fluid in the abdomen all day, absorbs glucose, can worsen hernias, and depends on a membrane that changes over time. Hemodialysis asks less of the abdomen and more of the circulation. Which trade-off suits you is a conversation with your team, informed by your heart, your habits and your preferences.

Why peritoneal dialysis eventually stops working for some people, and what switching involves

PD is frequently described as a treatment with a natural lifespan. That is broadly true, although the length varies enormously between individuals and some people continue for many years.

The main reason is the membrane itself. Years of exposure to glucose-based fluid, plus any episodes of peritonitis, gradually change the peritoneum. It thickens, its blood vessels multiply, and it starts absorbing glucose so quickly that the osmotic gradient fades before enough water has crossed. Clinicians call this ultrafiltration failure: waste may still clear reasonably, but fluid removal falls short, and swelling or high blood pressure creep back. In rare cases a more severe scarring process affects the bowel; teams monitor for this.

Other reasons are more practical. Repeated infections, catheter malfunction that cannot be fixed, hernias or fluid leaks that keep recurring, a loss of residual kidney function that leaves PD unable to deliver enough clearance, or simply a change in life circumstances that makes home exchanges impossible. Some people leave PD for the best reason of all: a transplant.

Switching between types of dialysis is common and moves in both directions. A person on PD whose membrane is failing can transition to hemodialysis, which involves creating vascular access, ideally arranged in advance so the change is planned rather than urgent. Someone on hemodialysis who struggles with access problems or wants to dialyze at home can move to PD once a catheter is placed and healed. The Cleveland Clinic and NIDDK both describe these transitions as part of normal kidney care.

What matters most is that the possibility is discussed early. Regular tests of membrane function and clearance let your team see a decline coming, so that a switch happens on your timetable, not in an emergency.

What people often get wrong about how peritoneal dialysis exchanges work

“The fluid cleans my blood while it’s flowing in and out.” The opposite is true. Almost all the waste removal happens during the dwell, when fluid sits still against the membrane. Fill and drain are just logistics.

“I have to lie down for the whole exchange.” You need to be near the bag during the fill and drain, and many people sit. During the dwell, you can walk, work, cook or sleep. That is what “ambulatory” means.

“Cloudy fluid is normal after a big meal.” It is not. Drained fluid should be clear enough to read print through. Cloudiness is the classic early sign of peritonitis and should be reported the same day, even if you feel fine.

“PD means no dietary limits.” Limits are usually looser than on in-center hemodialysis, especially for potassium, but protein needs rise, glucose absorption from the fluid counts toward your daily intake, and salt still drives thirst and fluid gain.

“If I miss an exchange I can double up later.” Dwell time and volume are prescribed together. Doubling volumes strains the abdomen and does not recover lost clearance. Contact your team about missed exchanges rather than improvising.

“Once you start PD you can never do anything else.” People move to hemodialysis, receive transplants, or return to PD after a break. Switching is a normal part of kidney care, not a failure.

“Peritoneal dialysis is a weaker form of dialysis.” Adequacy is measured, not assumed. A well-prescribed PD schedule delivers clearance judged sufficient by the same standards used for hemodialysis, and the NIDDK notes that its continuous nature may help preserve remaining kidney function. Whether it is right for you is a separate question, answered with your team.

Questions to ask your care team before and after starting PD

Bringing a written list to appointments is not a sign of anxiety; it is how good decisions get made. These questions are ones PD nurses and nephrologists answer regularly.

• Based on my membrane test, am I a fast or slow transporter, and how does that shape my dwell times?
• Would you recommend manual exchanges, a cycler, or a combination for my situation, and why?
• How much residual kidney function do I have, and how will we track whether it is changing?
• What fill volume are you planning, and what should it feel like when it is in?
• How will we know my dialysis is adequate, and how often will that be checked?
• Which strengths of fluid will I use, and what should prompt me to call before changing anything?
• What exactly should I do if the drained fluid is cloudy, if the drain is slow, or if I see blood in the bag?
• How do I care for the exit site, and what does a healthy site look like compared with an infected one?
• Who do I call out of hours, and what counts as urgent?
• How will PD affect my diet, my fluid allowance and my other medicines?
• Can I swim, bathe, travel or return to my job, and what precautions apply?
• If PD stops working well in the future, what is the plan, and should we prepare hemodialysis access ahead of time?
• Am I a candidate for the transplant list, and does PD affect that pathway?

Answers will be specific to you, which is exactly the point. A prescription built around your membrane, your kidneys and your daily life will look different from your neighbor’s, and understanding why is part of doing PD well.

When to call your doctor: red-flag signs on peritoneal dialysis

Most days on PD are uneventful. The skill is noticing the day that is not. Contact your kidney team promptly, the same day, if you notice any of the following, and seek urgent care if symptoms are severe or you cannot reach the team.

• Cloudy drained fluid, with or without abdominal pain or fever. This is the hallmark early sign of peritonitis, and prompt treatment protects the membrane. Keep the bag for testing if you can.
• Abdominal pain, tenderness or a rigid belly that is new or worsening, especially with nausea, vomiting or fever.
• Redness, swelling, warmth, pus or crusting at the exit site, or pain along the path of the catheter under the skin.
• Fluid leaking around the catheter or from the wound, or a new bulge in the groin or abdomen that may indicate a hernia.
• Drained volume repeatedly lower than fill volume, rapid weight gain, swollen ankles, or breathlessness, particularly when lying flat. These suggest fluid is not being removed adequately.
• Blood in the drained fluid that is more than a faint pink tinge or does not clear over subsequent exchanges.
• A catheter that will not drain or fill despite the troubleshooting steps you were taught, such as changing position or checking for kinks.
• Fever, chills or feeling generally unwell without another obvious cause.
• Chest pain, sudden severe shortness of breath, confusion or fainting, which need emergency care regardless of dialysis.

Never stop, skip or alter exchanges on your own in response to a problem unless your team has told you to. Call, describe what you see, and let them guide the next step. Early calls are welcomed; the situations teams worry about are the ones they hear about late.

Frequently asked questions

What is a PD exchange?

A PD exchange is one complete cycle of draining used dialysis fluid out of the abdomen and filling it with fresh fluid, which then dwells for several hours. During the dwell, waste and excess water move from blood vessels in the peritoneal lining into the fluid. Manual exchanges take about 30 to 40 minutes of hands-on time according to the NIDDK; a cycler performs them automatically overnight. Your team sets how many you need each day.

What is the rule of 4 in peritoneal dialysis?

There is no formal rule of 4 in kidney guidelines. The phrase usually refers to the typical CAPD pattern of about four exchanges a day spaced through waking hours, or to a personal four-point check some patients use: clear bag in, clear fluid out, volume out at least volume in, and a healthy exit site. Your own prescription may differ, and it should always follow your team’s plan rather than a rounded number.

What is the most gentle dialysis?

Gentleness is not a clinical measurement, but peritoneal dialysis removes waste and fluid continuously and slowly, so it tends to cause smaller swings in blood pressure and fewer post-session symptoms than hemodialysis, which does the same work in a few hours. The NIDDK notes PD may be easier on the heart and may help preserve remaining kidney function. It has its own demands, including daily fluid in the abdomen and infection risk, so suitability is individual.

Can you switch from one type of dialysis to another?

Yes, and switching in either direction is a normal part of kidney care. People on PD may move to hemodialysis if the membrane stops removing enough fluid, after repeated infections, or for practical reasons; people on hemodialysis may move to PD for home treatment or access problems. Each switch needs new access, either a vascular access or a healed PD catheter, so teams prefer to plan transitions in advance rather than in an emergency.

Why does peritoneal dialysis eventually fail?

The most common reason is gradual change in the peritoneal membrane after years of exposure to glucose-based fluid and any episodes of peritonitis. It thickens and absorbs glucose faster, so water stops crossing efficiently, a state called ultrafiltration failure. Other causes include recurrent infection, catheter problems, hernias or leaks, and loss of residual kidney function. Regular membrane and clearance tests let teams spot decline early and plan a switch on your timetable.

How long does a PD exchange take?

The hands-on portion of a manual exchange, draining the old fluid and filling with new, takes about 30 to 40 minutes according to the NIDDK, with draining usually the slower half. The dwell in between commonly lasts about 4 to 6 hours during the day and longer overnight. On a cycler, the machine runs exchanges over roughly 10 to 12 hours while you sleep. Exact times are set by your kidney team.

What is the difference between CAPD vs APD?

CAPD, continuous ambulatory peritoneal dialysis, means you perform exchanges by hand using gravity, typically about four times a day, and carry fluid between them. APD, automated peritoneal dialysis, uses a bedside cycler that runs several exchanges overnight, often leaving one long dwell or an empty abdomen during the day. Both use the same fill, dwell and drain physiology; the choice depends on your membrane type, lifestyle and your team’s assessment.

Does a peritoneal dialysis exchange hurt?

For most people, no. The fill produces a sensation of fullness similar to a large meal, and the end of the drain can cause a brief pulling or cramping feeling as the last fluid leaves. Cold fluid can cause cramps, which is why bags are warmed. New or persistent abdominal pain is not expected and should be reported, especially if the drained fluid is cloudy, because it may signal peritonitis.

Can I shower, swim or exercise with a PD catheter?

Showering is usually allowed once the exit site has healed, with the site protected and dried afterward as your team teaches. Swimming is more restricted; many teams permit it only in chlorinated pools or the sea with a waterproof dressing, and some advise against it, so ask before you go. Walking, cycling and most exercise are encouraged, while heavy lifting and straining are often limited because they can raise hernia risk.

What does it mean if my drain volume is less than my fill volume?

The drained fluid should normally be slightly more than what went in, because it carries extra water removed from your body. A single low drain may be due to a kink, constipation, position or incomplete draining. Repeated low volumes, especially with weight gain or swelling, can indicate fluid is being retained or that the membrane is removing less water, and your kidney team should be told so they can investigate and adjust the prescription.

References

• NIDDK (NIH): Peritoneal Dialysis
• NHS: Dialysis, what happens
• MedlinePlus: Peritoneal dialysis

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.