- CPDN stands for Certified Peritoneal Dialysis Nurse, a credential awarded by BONENT.
- The exam has 150 multiple-choice questions and a 3-hour time limit.
- Nursing Process makes up 60% of the exam, and Education adds another 20%.
- Certification renews every four years and requires 40 contact hours, at least 30 of them Group A.
What CPDN Actually Means
CPDN stands for Certified Peritoneal Dialysis Nurse. It is a professional certification for nurses who care for patients receiving peritoneal dialysis (PD), the home-based kidney replacement therapy in which dialysate is exchanged through a catheter in the abdomen rather than through a machine-based blood circuit at a dialysis center.
The credential signals that a nurse has met defined experience requirements and passed a standardized examination covering the clinical, educational and administrative demands of a peritoneal dialysis program. It is a nursing credential, not a technician credential, and it is distinct from the certification BONENT offers for hemodialysis technicians (CHT).
If you are searching for a quick definition, our related explainers cover the same ground from different angles: What Does CPDN Stand For?, CPDN Meaning and What Is CPDN Certification? This article goes further, walking through the exam, the eligibility routes, the fees and how the credential is maintained.
Who Issues the Credential
The CPDN is issued by the Board of Nephrology Examiners Nursing and Technology (BONENT). BONENT is a certifying body focused on nephrology nursing and dialysis technology, and the Certified Peritoneal Dialysis Nurse examination is its PD-specific nursing credential. When you register, apply, test and later recertify, you are dealing with BONENT directly.
For a broader overview of how the certification fits into a nephrology nursing career, see our page on CPDN certification.
Exam Format and Scoring
The CPDN exam is a closed-book, multiple-choice test. The essentials:
| Feature | CPDN Detail |
|---|---|
| Number of questions | 150 multiple-choice |
| Time allowed | 3 hours |
| Passing standard | Scaled score of 70 on a 1-100 scale |
| Delivery options | Paper-and-pencil or center-based computer-based testing (CBT) |
| Reference materials | None; closed book |
Why the scaled score matters
The pass mark is a scaled score of 70, not a verified 70% raw-score cutoff. Scaled scoring adjusts for differences in difficulty between exam forms, so the number of questions you must answer correctly is not something candidates should try to calculate. Treat the exam as a competency threshold: your aim is solid command of every domain, not the minimum number of correct answers. Our CPDN passing score guide explains this in more detail.
Question style
Expect scenario-driven items that ask what a competent PD nurse would do, assess or teach. Because Nursing Process carries 60% of the exam, a large share of questions place you at the bedside or on the phone with a home patient: interpreting an effluent change, responding to a catheter exit-site finding, adjusting teaching after a missed exchange. Memorizing isolated facts helps less than understanding why a given action is the safest and most appropriate next step.
On computer-based testing, the interface permits you to review questions and change answers before you finish, so you can flag difficult items and return to them within the 3-hour window.
The Four Content Domains
BONENT publishes a detailed examination content outline, and the four domains below are formal examination objectives with official weights. They tell you what the exam measures, not how many hours to spend studying each area. For the full breakdown, see our complete guide to the CPDN exam domains.
| Domain | Official Weight |
|---|---|
| Domain 1: Nursing Process | 60% |
| Domain 2: Administration | 10% |
| Domain 3: Education | 20% |
| Domain 4: Professional Development | 10% |
Domain 1: Nursing Process (60%)
This is the clinical core of the exam. Questions follow the nursing process as applied to peritoneal dialysis patients, from assessment through planning, intervention and evaluation.
- Assessing PD patients, including exit-site condition, fluid status and signs of complications
- Understanding prescriptions, exchange techniques and the differences between continuous ambulatory and automated modalities
- Recognizing and responding to peritonitis, catheter dysfunction and other PD-related problems
- Monitoring adequacy, nutrition and laboratory trends in the context of kidney failure
- Planning and evaluating care, then adjusting interventions based on patient response
Domain 2: Administration (10%)
The smallest-weight clinical-systems domain addresses how a PD program operates and how nurses contribute to quality and safety.
- Program-level responsibilities and coordination of care
- Quality improvement and documentation expectations
- Infection control and safety practices within a home dialysis program
Domain 3: Education (20%)
Peritoneal dialysis is a self-managed therapy, so patient and caregiver teaching is central to the nurse's role and heavily tested.
- Training patients and caregivers on aseptic technique and exchange procedures
- Assessing learning needs, barriers and readiness to perform therapy at home
- Reinforcing teaching, retraining after complications and evaluating whether the patient truly understands
Domain 4: Professional Development (10%)
This domain covers the nurse's responsibilities as a professional within nephrology nursing.
- Scope of practice and accountability
- Ongoing learning, standards of practice and ethical considerations
- Contributing to the profession and maintaining competence
Key Takeaway
Nursing Process and Education together account for 80% of the exam. If you are short on time, those two domains deserve the deepest, most scenario-based practice, though you should not ignore Administration or Professional Development.
For a one-page recap of what to memorize, the CPDN cheat sheet condenses the highest-yield points.
Eligibility: RN and LPN/LVN Routes
BONENT sets different experience minimums depending on your license. In both cases you must hold a valid nursing license and be actively participating in an ESRD (end-stage renal disease) facility.
| Requirement | RN Route | LPN/LVN Route |
|---|---|---|
| License | Valid nursing license | Valid nursing license |
| Nephrology experience | At least 1 year | At least 2 years |
| Facility participation | Active participation in an ESRD facility | Active participation in an ESRD facility |
References and the unemployed-applicant exception
Your application must include two signed, dated references: one from your immediate supervisor and another from a nephrology professional. If you are currently unemployed, BONENT's published exception allows qualifying applicants to document their experience through their immediate past supervisor. Read the current rules carefully before you apply, since BONENT's website is the authority on exactly what documentation it accepts. Our CPDN requirements guide walks through the full eligibility picture.
Registration, Fees and Testing Rules
Exam fees
United States examination fees are set by delivery method:
- Paper-and-pencil testing: $235
- Computer-based testing (CBT): $255
These figures come from BONENT's current eligibility-and-fees page, which supersedes older prices printed in the candidate handbook. Always confirm the current amount on BONENT's site before paying. A fuller cost picture, including maintenance fees, is in our CPDN certification cost breakdown.
Choosing paper or CBT
BONENT offers both paper-and-pencil testing and center-based CBT, and its official CBT center directory is hosted at smttest.com. If you choose CBT, you must test within six months of your confirmation letter, so plan your preparation timeline before you submit your application rather than after. Scheduling windows and deadlines are covered in our CPDN exam dates guide.
What to bring and what to leave behind
The exam is closed book. You will need your confirmation documents and approved identification. Personal books, calculators and electronic devices are prohibited. The details are on BONENT's day-of-exam page and in its candidate handbook, so review them in the days before you test and avoid surprises at check-in.
Where CPDN Nurses Work
Certified peritoneal dialysis nurses are found wherever PD is taught, delivered and monitored. Typical settings include:
- Home dialysis programs within dialysis organizations, where nurses train new PD patients and follow them over time
- Outpatient dialysis clinics that run a PD service alongside in-center hemodialysis
- Hospital-based nephrology and dialysis units that manage PD patients during admissions or initiate therapy
- Nephrology practices and clinics that coordinate chronic kidney disease and modality education
Because PD is delivered at home, much of the job is teaching, troubleshooting and follow-up rather than hands-on treatment at a chairside machine. That is why Education carries 20% of the exam. For a look at the employment side, see our pages on CPDN jobs, the CPDN salary guide and a frank analysis of whether the credential is worth it.
Keeping the Credential Active
CPDN certification renews every four years. The rules below reflect BONENT's 2026 Recertification Booklet, effective January 1, 2026.
Your renewal options
- Continuing education: Complete 40 contact hours, including at least 30 nephrology-related Group A hours.
- Re-examination: Retake the examination instead of submitting contact hours. The examination fee applies on this route.
- Once-in-a-lifetime waiver: BONENT offers a continuing-education waiver that can be used one time over a certificant's career.
Annual maintenance fees
Maintenance fees are payable even if you use the waiver. Annual maintenance costs $65, or $240 if you prepay all four years. When maintenance requirements are satisfied, routine recertification carries no additional processing fee, although the examination route still requires the examination fee.
Key Takeaway
Start tracking Group A contact hours early in each four-year cycle. Thirty of your forty hours must be nephrology-related, and gathering them gradually is far easier than scrambling near the deadline.
Sequencing Your Preparation Around the Blueprint
Rather than a generic schedule, tie your calendar to how the exam is built. Because Nursing Process is 60% of the questions, it should anchor your plan, with Education layered in early since teaching scenarios appear throughout the clinical content too. Our full CPDN study guide expands on this, and one sample ordering looks like this:
Nursing Process foundations
- Work through assessment, modalities, peritonitis and catheter complications
- Do scenario questions daily, explaining why each wrong option is wrong
Education
- Review training approaches, adult learning barriers and retraining after complications
- Practice writing what you would teach a patient in plain language
Administration and Professional Development
- Cover quality, safety, documentation, scope of practice and standards
- These are lower-weight but score-relevant, so brief and focused review pays off
Timed practice and gap review
- Take timed sets sized to the 3-hour, 150-question format
- Return to whichever domain produced your weakest results
Timed practice is especially useful here, since you will need to average roughly a little over a minute per question. To gauge difficulty honestly, read How Hard Is the CPDN Exam? and what the data shows about the CPDN pass rate. When you are ready to test yourself on realistic questions, try the CPDN practice tests and review your results by domain.
If you want structured teaching content before you practice, our overview of CPDN training outlines your options, and the main practice site lets you drill the question style you will see on exam day.
Frequently Asked Questions
CPDN stands for Certified Peritoneal Dialysis Nurse. It is a nursing certification issued by the Board of Nephrology Examiners Nursing and Technology (BONENT) for nurses who care for patients on peritoneal dialysis.
The exam contains 150 multiple-choice questions and allows 3 hours. It is closed book, and on CBT you can review questions and change answers during the session.
Passing requires a scaled score of 70 on a 1-100 scale. This is a scaled score rather than a verified 70% raw-score threshold, so focus on mastering all four domains rather than calculating a minimum number correct.
Yes. The LPN/LVN route requires a valid license, at least two years of nephrology experience and active participation in an ESRD facility. The RN route requires a valid license, at least one year of nephrology experience and active ESRD participation.
US exam fees are $235 for paper testing and $255 for CBT. Certification renews every four years, and annual maintenance is $65, or $240 if you prepay four years. Check BONENT's current fee pages before paying, since they supersede older printed prices.