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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Before you can start peritoneal dialysis, a thorough evaluation is necessary. This is not a decision made lightly; it involves a series of tests and assessments to ensure that this specific type of treatment is safe and effective for your body. The medical team needs to confirm that your kidneys have reached a point where dialysis is required and, more importantly, that your abdomen is capable of doing the work. This process is a collaboration between you, your nephrologist (kidney doctor), and a specialized dialysis nurse. It involves blood work, physical exams, and discussions about your home life and ability to perform self-care. This section outlines the steps taken to diagnose the need for dialysis and evaluate your suitability for P
The primary tool for deciding when to start dialysis is the estimated glomerular filtration rate, or eGFR. This is a mathematical calculation based on the level of creatinine in your blood. Creatinine is a waste product from muscle wear and tear. Healthy kidneys filter it out; failing kidneys do not.
When your eGFR drops below 15, you are considered to be in kidney failure (Stage 5). However, doctors don’t look at the number alone. They look at how you feel. If your eGFR is 12 but you feel fine and have no swelling, you might wait. If it is 14, but you are vomiting and exhausted, you might start sooner. This blood test is the benchmark for tracking the decline of kidney function and timing the start of therapy appropriately.
Once you have the catheter placed and have started training, your team will perform a specific test called the Peritoneal Equilibration Test, or PET. This is not a test you pass or fail; rather, it is a test to characterize how your personal membrane works. Everyone’s peritoneum is different—some filter waste rapidly, others more slowly.
The PET measures how fast sugar moves from the dialysis fluid into your blood and how fast creatinine moves from your blood into the fluid. Based on this speed, you are classified as a high, high-average, low-average, or low transporter.
A “high transporter” has a membrane that acts like a sieve with large holes. Waste moves across rapidly, but the sugar (which pulls the water) is absorbed into the body quickly too. These patients often do better with short, frequent exchanges, making them ideal candidates for the nighttime machine (cycler). “Low transporters” absorb sugar slowly, so the fluid stays in the belly longer and keeps pulling water for hours. They often do well with the manual daytime method because they need long dwell times to clean the blood effectively.
Since peritoneal dialysis is a home-based therapy, your living situation is part of the medical evaluation. You do not need a hospital-sterile room, but you do need a clean, dry, and safe space to perform exchanges. A nurse may discuss your home setup with you.
You need an area free from drafts (fans, open windows) and pets during the actual connection and disconnection process to prevent dust and hair from causing infections. You also need space to store about a month’s worth of supplies, which can be 30–40 boxes of fluid. If your home is tiny, the team can help you arrange for more frequent, smaller deliveries. The goal is to ensure you have a stable environment where you can perform the treatment without a high risk of contamination.
Peritoneal dialysis requires a certain level of manual skill. You must be able to wash your hands thoroughly, handle small plastic tubes, twist clamps, and connect sterile caps without touching the tips. During the evaluation, the nurse will observe your hands and eyesight.
If you have severe arthritis, tremors, or poor vision, performing the manual steps might be risky. However, this does not automatically rule you out. Devices exist to help with connections, or a family member can be trained to assist you. The team tests your ability to learn and solve problems, like what to do if the power goes out or a tube is contaminated. It is about ensuring you can manage the routine safely.
Before dialysis can begin, the access tube must be inserted. You will be referred to a surgeon for an evaluation. They will examine your abdomen to check for hernias or scars from previous surgeries. Extensive scar tissue inside the belly can create pockets that prevent the fluid from flowing freely, which might make PD impossible.
The surgeon will check your overall health to ensure you can undergo anesthesia safely. They will discuss where the catheter exit site should be.
The placement of the exit site is critical for your comfort. The surgeon or nurse will look at your beltline—where you wear your pants or skirts. They want to place the catheter exit site away from this beltline so that your clothing doesn’t rub or irritate it. They will also mark a spot that is easy for you to see and reach for daily cleaning. This planning prevents complications and discomfort later on.
Starting dialysis is a major life change. The evaluation includes assessing your mental and emotional readiness. It is normal to feel overwhelmed, anxious, or depressed. The social worker on the team will talk to you about your support system and coping mechanisms.
You need to be motivated to perform the treatment every single day. There are no “days off” with the kidney. Burnout is a real risk. The team looks for signs that you are committed to the process and willing to take responsibility for your care. If you are struggling, they can provide resources or suggest starting with a partner to help ease the burden. Understanding that your care is a long-term commitment is vital for success.
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Supplies take up space, but you can be creative. Under beds, in closets, or even stacking boxes with a tablecloth to use as a table are options. Delivery companies can also deliver smaller amounts more often.
No. It involves taking samples of your drained fluid and a blood sample at specific times. It is painless but requires you to be at the clinic for about 4 hours.
Yes. Pets just need to be kept out of the room during the actual exchange (connecting and disconnecting) to keep the air clean. They can be in the house the rest of the time.
There are assist devices that help guide the tubing connections. Furthermore, having a “care partner” (spouse or child) trained to help you can make it possible.
Ideally, the catheter needs about 2 weeks to heal before being used to prevent leaks. However, in urgent cases, it can be used sooner with small volumes of fluid while you are lying down.
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