Nephrology focuses on diagnosing and treating kidney diseases. The kidneys filter waste, balance fluids, regulate blood pressure, and manage acute and chronic conditions.
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Once the catheter is placed and training is complete, the treatment phase begins. Peritoneal dialysis becomes a part of daily life, much like brushing teeth or eating meals. It is a rhythm that patients settle into. The treatment is not passive; it requires active participation and attention to detail. However, this effort buys freedom and control. Instead of a schedule dictated by a clinic, you dictate your own schedule within the medical parameters. Follow-up is regular but less intrusive than hemodialysis, allowing for a more normal lifestyle. This section breaks down the daily mechanics of the treatment, the differences between using a machine versus manual bags, and what to expect from ongoing medical supervision.
The core of peritoneal dialysis is the “exchange.” Whether you use a machine or manual bags, the steps of an exchange follow a universal pattern: Drain, Fill, and Dwell. First, you must drain the used fluid that has been in your belly for several hours. This fluid contains the waste and excess water your body needs to get rid of.
Once the abdomen is empty, you fill it with fresh sterile solution. This fluid flows in through the catheter by gravity or pump. Once the fill is complete, you disconnect or cap off the tubing. The fluid then “dwells” inside you for a set period—usually 4 to 6 hours during the day. During this dwell time, the cleaning happens silently and painlessly inside you. You are free to move, work, and live your life.
Automated Peritoneal Dialysis (APD) is the most popular form of treatment in the US because it allows patients to have their days free. It uses a machine called a cycler, which is about the size of a printer.
Before bed, you set up the machine. This involves placing a disposable plastic cassette into the cycler and connecting bags of dialysis solution to it. The machine primes the tubing to remove air. You then connect your catheter to the machine’s long patient line.
Once connected, you go to sleep. While you rest, the machine quietly performs the exchanges. It drains the old fluid, fills you with new fluid, lets it dwell for an hour or two, and then drains it again. It typically repeats this 3 to 5 times a night. In the morning, you disconnect. The machine tracks all the data—how much fluid went in and how much came out—often sending it wirelessly to your nurse for review.
Continuous Ambulatory Peritoneal Dialysis (CAPD) does not use a machine. It relies on gravity. This is a great option for people who travel frequently or prefer not to use technology.
To do an exchange, you hang a bag of solution on an IV pole or a high hook. You connect your catheter to the tubing set. First, you place the drain bag on the floor. Gravity pulls the used fluid out of your belly into the drain bag.
Once empty, you open the clamp on the fresh bag up high. Gravity pulls the clean fluid into your belly. The whole process takes about 30 minutes. You do these exchanges upon waking, at lunch, at dinner, and before bed. The benefit is simplicity; you can do an exchange anywhere you have a clean surface and privacy—at work, in a hotel, or at a friend’s house.
Sometimes, the fluid doesn’t flow as fast as it should. This is a common troubleshooting scenario. If the fluid drains slowly, it might be due to constipation. A full bowel can press on the catheter inside the belly, blocking the flow. Keeping bowels regular is a giant part of PD success.
Position also matters. If the catheter tip has moved slightly against the bowel wall, the flow might stop. Often, simply standing up, changing position, or rolling side-to-side can get the fluid moving again. Fibrin, a protein made by the body, can also clog the tube. If you see white strands in the drain bag, your nurse might tell you to add a medication called heparin to the fluid to prevent clogs.
Even though you treat yourself at home, you are never alone. You will visit your dialysis clinic once a month. These visits are comprehensive. You will see your nephrologist to review your health, your nurse to check your catheter site, a dietitian to review your blood work and eating habits, and a social worker.
Blood is drawn to check your cleaning levels. They look at the “Kt/V” score, which is a math formula that tells them if the dialysis is removing enough waste. They also check for anemia and bone mineral balance. You might be asked to bring your drain bags or a sampling of them to measure exactly how much waste is being removed. This monthly check-up is the time to adjust your prescription—perhaps changing the strength of the fluid or the number of cycles to ensure you are getting adequate treatment.
Dialysis is not “set it and forget it.” Your body changes, and your prescription must change with it. If you still have some kidney function (you still make urine), you might need fewer exchanges. As natural kidney function declines over years, you will likely need to increase the dialysis dose.
This might mean adding an extra exchange during the day, using a larger volume of fluid, or switching from manual to automated dialysis. You also adjust the fluid concentration (1.5%, 2.5%, or 4.25% dextrose) daily based on your weight and swelling. If you are swollen, you use a higher-strength sugar solution to pull off more water. This ability to self-adjust fluid removal day-to-day is a powerful tool for managing heart health.
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The machine has a battery backup for alarms, but it won’t pump. You can perform a “manual drain” to disconnect safely. You should have manual bags on hand as a backup for emergencies.
Yes. Cold fluid can cause cramping. The cycler has a built-in heater plate. For manual bags, you can use a heating pad or a special warmer. Never microwave the bags.
No. Dialysis needs to be done daily. Skipping even one treatment allows toxins and fluid to build up, which can make you feel sick or raise your blood pressure dangerously
You will usually order monthly from a supplier. The nurse helps you set up the initial order, and then you call or order online to replenish stock based on what you have used.
This is an emergency risk for infection. You must clamp the line immediately between you and the leak and call the clinic. Do not continue the treatment with damaged tubing.
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