CAPD vs APD: Comparing the Two Types of Peritoneal Dialysis
Posted 16 Jul 2026 | Source:
If you are considering peritoneal dialysis, you will encounter two forms of it: continuous ambulatory peritoneal dialysis, known as CAPD, and automated peritoneal dialysis, known as APD. Both use the same underlying principle — filtering through the lining of the abdomen — but they differ in how the exchanges of fluid are carried out, and each suits different lifestyles and circumstances. This article compares the two to help you understand the choice.
The shared foundation
Before comparing them, it is worth restating what CAPD and APD have in common, since the difference between them is only in the method of doing the exchanges. Both use a catheter placed in the abdomen, both work by introducing dialysate that draws waste and excess fluid across the peritoneal membrane, and both are done at home. Both require careful hygiene to prevent infection, and both offer the independence and flexibility that characterise peritoneal dialysis. The choice between them is therefore not a choice between different treatments, but between two ways of delivering the same treatment.
CAPD: manual exchanges through the day
In continuous ambulatory peritoneal dialysis, the exchanges are performed manually, by hand, several times during the day — commonly a few times spread across waking hours. Each exchange involves draining the used fluid and introducing fresh fluid, which then dwells in the abdomen until the next exchange.
The process for each exchange takes a relatively short time, and in between, the fluid does its work while you carry on with normal activities, hence the term “ambulatory.”
CAPD has the advantage of simplicity and portability: it requires no machine, so there is less equipment, and exchanges can be done wherever there is a clean space, which can make it easier to travel with. Its main consideration is that it requires several interruptions during the day to perform the exchanges, which has to be fitted around daily life. For people whose days can accommodate these breaks, and who value simplicity and minimal equipment, CAPD can work very well.
APD: automated exchanges overnight
In automated peritoneal dialysis, a machine carries out the exchanges automatically, usually overnight while you sleep. You connect to the machine at bedtime, it performs a series of exchanges through the night, and you disconnect in the morning. This typically leaves the daytime free of exchanges, or with minimal daytime involvement.
APD’s main advantage is that it concentrates the treatment into the night, freeing up the day for work, study, family, or other activities without the interruption of daytime exchanges. This makes it attractive to many people with daytime commitments. The considerations are that it involves a machine, which requires setting up each night and occupies space at home, and that it ties you to the machine overnight. For people who prefer to keep their days free and do not mind connecting to a machine at night, APD is often the preferred choice.
How the choice is made
The choice between CAPD and APD depends on a mix of practical and personal factors. Your lifestyle and daily commitments matter: someone with a structured daytime job or studies may prefer APD’s free days, while someone with a more flexible day or who travels often may prefer CAPD’s simplicity. Your living situation matters, including space for the APD machine and supplies. Medical factors can also influence the decision, as the two methods can differ in how effectively they remove waste and fluid for a given individual, something your kidney team can assess. And personal preference plays a genuine part — some people simply feel more comfortable with one approach than the other.
It is also worth knowing that the choice is not always permanent. Some people start with one form and switch to the other as their circumstances or needs change, and some use a combination. Your kidney team can guide you to the option that fits you best at the outset and can adjust it over time.
Support and training for both
Whichever form you choose, you will receive thorough training before starting, so that you can carry out the treatment safely and confidently. This training covers the technique of the exchanges, the all-important hygiene practices to prevent infection, the care of your catheter and exit site, and how to recognise and respond to any problems. Ongoing support from your peritoneal dialysis team continues after you start, and you can always reach them with questions or concerns. This support makes both CAPD and APD manageable for people who might initially feel daunted by the idea of doing their own dialysis.
The takeaway
CAPD and APD are two ways of delivering the same home-based peritoneal dialysis. CAPD uses manual exchanges spread through the day, offering simplicity and portability; APD uses a machine overnight, freeing up the daytime. The right choice depends on your lifestyle, your living situation, medical factors, and your preference, and it can sometimes be changed later. Your kidney team can help you weigh these factors and choose the approach that fits your life best.
Choosing between CAPD and APD depends on your circumstances and preferences. A nephrologist can help you understand which might suit you better. A video consultation is a convenient way to discuss peritoneal dialysis options.
