Dialysis Process Explained: What Happens During Treatment

At-a-Glance Summary

• Dialysis is a structured, carefully monitored procedure that replaces some of your kidneys’ essential functions.
• Hemodialysis (HD) cleans your blood through a machine, usually three times per week, under continuous nurse supervision.
• Peritoneal Dialysis (PD) uses your body’s own peritoneal membrane as a natural filter, allowing home-based treatment during the day or overnight.
• Understanding the process helps reduce fear and makes sessions more comfortable and predictable.
• At Florida Kidney Physicians, every treatment is guided by safety, compassion, and education.

Introduction

It’s normal to feel anxious before your first dialysis session. Many patients tell us that what worried them most was simply not knowing what to expect. At Florida Kidney Physicians, we believe that information is one of the most effective forms of reassurance.

This article walks you step by step through what happens during dialysis — whether you’re starting hemodialysis in a center or doing peritoneal dialysis at home. Knowing what’s ahead helps you feel prepared, calm, and confident in your treatment journey.

Hemodialysis Step by Step

1. Arrival and Preparation
   Before each session, you’ll check in with your dialysis team. A nurse records your weight, blood pressure, temperature, and pulse. These measurements help determine how much fluid should be removed during treatment. You’ll then sit in a comfortable reclining chair, often in a shared treatment room.
2. Connecting to the Machine
   Your access site — usually an arteriovenous (AV) fistula or a catheter — is cleaned using strict sterile technique. For a fistula, two small needles are inserted: one draws blood to the machine, and the other returns it once filtered. Many patients find that any discomfort lasts only a few seconds. Numbing creams or smaller needles can be used to reduce stinging.
3. The Filtration Process
   Blood flows through soft tubing into a filter called a dialyzer, which acts as an artificial kidney. Inside, toxins and excess fluid pass into a cleansing solution (dialysate), and clean blood returns to your body.
   
   During this time, your blood pressure, heart rate, and machine readings are monitored continuously by nurses. Any small change — like cramping, dizziness, or a blood pressure drop — can be corrected immediately.
4. Duration and Routine
   A typical hemodialysis session lasts about 3 to 4 hours, performed three times a week. While connected, you can read, rest, listen to music, or use a tablet. Many patients describe the experience as peaceful once they establish their routine.
5. Completion and Aftercare
   When the session ends, the needles are removed and a small dressing is applied. You’ll rest briefly while your vital signs are rechecked. Nurses provide hydration and recovery guidance — such as standing slowly to avoid dizziness. Some people feel tired afterward, while others continue their day normally.

Your dialysis team is with you at every moment, adjusting treatments to keep you safe and comfortable.

Peritoneal Dialysis: How It Works

While hemodialysis cleans the blood externally, peritoneal dialysis (PD) uses your body’s own abdominal lining — the peritoneum — as a natural filter. This allows you to perform dialysis at home, often while you sleep.

1. The PD Catheter
   A soft, flexible tube is placed in your lower abdomen during a brief outpatient procedure. Once healed, it becomes your access point for dialysis fluid (dialysate). Proper handwashing and site care are key to preventing infection.
2. The Exchange Process
   Each PD treatment, called an exchange, involves three steps:
   
   • Drain the used dialysis fluid from your abdomen.
   • Fill with fresh solution through the catheter.
   • Dwell — the fluid stays inside for several hours, allowing waste and extra fluid to move from your blood into the solution.
3. CAPD vs. APD
   • Continuous Ambulatory Peritoneal Dialysis (CAPD): You perform 4–5 manual exchanges during the day, each taking about 30 minutes. You can do this at work, at home, or while traveling.
   • Automated Peritoneal Dialysis (APD): A small machine called a cycler performs the exchanges automatically overnight while you sleep, leaving your daytime free.
4. Comfort and Sensations
   Some patients notice a mild feeling of fullness in the abdomen when the fluid enters. This usually improves as your body adapts. PD should never cause pain. Your FKP nurse will train you until each step feels easy and natural.

Monitoring and Safety During Treatment

Whether you’re in a dialysis center or at home, your safety is the priority.

For hemodialysis:

• Dialysis machines have built-in sensors and alarms to detect any change in blood flow or pressure.
• Staff monitor you visually and electronically at all times.
• Blood tests are done regularly to ensure the treatment prescription remains correct.

For peritoneal dialysis:

• Your home cycler automatically tracks and stores treatment data.
• Nurses review your logs at follow-up visits.
• You’ll learn infection prevention, including hand hygiene, mask use, and recognizing signs of peritonitis (abdominal pain, cloudy fluid, fever).

At Florida Kidney Physicians, infection control follows national safety standards, with disposable supplies, disinfected workspaces, and routine audits to ensure the highest level of care.

You are never alone during dialysis — even at home, your team is always within reach.

Comfort and Recovery Tips

• Before treatment: Eat a light meal and wear loose, comfortable clothing. Avoid heavy foods or large fluid intake.
• During treatment: Relax — read, listen to calming music, or practice slow breathing. These habits reduce anxiety and cramping.
• After treatment: Rest for a short period, rehydrate as directed, and follow your dietary plan. Most patients find their energy increases as they adapt to regular treatments.

If you feel lightheaded or fatigued, let your care team know. Adjustments in fluid removal or treatment time can help you feel better. Small changes often make a big difference.

Your Role in a Successful Session

Dialysis is teamwork — and you’re the most important member of that team.
You can make each treatment more effective by:

• Arriving on time and protecting your access arm or PD catheter.
• Keeping a treatment log with your weight, blood pressure, and symptoms.
• Reporting any swelling, shortness of breath, or unusual fatigue.
• Following dietary and fluid guidelines given by your renal dietitian.
• Asking questions whenever something doesn’t feel right.

Active participation turns dialysis from something that’s done to you into something you do for yourself.

FAQs

1. Does dialysis hurt?
   Hemodialysis needle sticks may cause brief stinging, but most patients adapt quickly. Peritoneal dialysis is generally painless. Your care team will make sure you’re comfortable.
2. Can I move or eat during treatment?
   Yes. Gentle movement is fine, and light snacks are often allowed. Always check with your nurse first.
3. What if I feel sick during dialysis?
   Tell the nurse immediately. Adjustments in fluid removal, temperature, or positioning can relieve symptoms like cramps or nausea.
4. Is it safe to sleep during treatment?
   Absolutely. Many patients nap during hemodialysis or while the PD cycler runs overnight. Machines and staff continuously monitor your safety.

At Florida Kidney Physicians, every dialysis session is a partnership. Our specialists focus on your safety, comfort, and confidence, guiding you through each step of the process — because understanding your treatment is the first step toward living well with kidney disease.