- What the CPDN Credential Actually Is
- Who Issues It and What It Covers
- Eligibility: RN and LPN/LVN Routes
- Exam Format and Scoring
- The Four Exam Domains
- Applying, Fees, and Test-Day Rules
- Keeping the Credential: Four-Year Renewal
- Where the Credential Fits in Your Career
- Sequencing Your Preparation Around the Blueprint
- Frequently Asked Questions
- CPDN stands for Certified Peritoneal Dialysis Nurse, a credential awarded through the Board of Nephrology Examiners Nursing and Technology (BONENT).
- The exam has 150 multiple-choice questions, a 3-hour limit, and a passing scaled score of 70 on a 1-100 scale.
- Nursing Process makes up 60% of the blueprint; Education adds another 20%.
- RNs need one year of nephrology experience; LPN/LVNs need two years, plus active ESRD facility participation.
What the CPDN Credential Actually Is
CPDN certification is a professional credential for nurses who care for patients treated with peritoneal dialysis (PD). The letters stand for Certified Peritoneal Dialysis Nurse. Earning it signals that a nurse has met defined experience requirements and passed a standardized examination covering the clinical, administrative, educational, and professional sides of PD nursing.
Because the acronym is shared with other credentials in unrelated fields, it helps to be precise. This article is about the nursing certification in nephrology, not any similarly abbreviated credential. If you want a quick definitional overview first, our pages on what CPDN stands for and what a CPDN is cover the basics, and this guide goes deeper into mechanics.
Who Issues It and What It Covers
The certifying body is the Board of Nephrology Examiners Nursing and Technology (BONENT). BONENT publishes the examination content outline, handles applications and eligibility review, delivers the exam, and administers recertification. Because BONENT's published pages govern the details, always confirm current fees and policies on the official site before you apply. Where older candidate handbook figures differ from current fee pages, the current pages take precedence.
The exam tests the full scope of a PD nurse's role rather than a single skill. That means technique and assessment at the bedside, but also program administration, patient and family teaching, and your own professional growth. The blueprint breakdown later in this article shows how heavily each of those areas is weighted.
Eligibility: RN and LPN/LVN Routes
BONENT sets two standard pathways depending on your license. Both require a valid nursing license and active participation in an end-stage renal disease (ESRD) facility; they differ in the amount of nephrology experience required.
| 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 ESRD facility participation | Active ESRD facility participation |
BONENT also publishes an exception for qualifying applicants who are currently unemployed: they may document their experience through their immediate past supervisor. Applications require two signed, dated references. One must come from your immediate supervisor, and the other from a nephrology professional. Line up both references before you start the application so a missing signature doesn't stall your timeline.
For a fuller walk-through of documentation and edge cases, see our guide to CPDN requirements, eligibility, and prerequisites.
Exam Format and Scoring
The CPDN examination consists of 150 multiple-choice questions with a 3-hour time allowance. That works out to a little over a minute per question, which is comfortable for candidates who know the material but unforgiving for anyone who has to reason every item from scratch.
Two Delivery Methods
- Paper-and-pencil testing at scheduled administrations.
- Computer-based testing (CBT) at testing centers. BONENT's official CBT center directory is hosted at smttest.com.
For CBT, candidates must test within six months of their confirmation letter. The computer interface lets you review questions and change answers, so you can flag uncertain items and return to them before time expires.
What a Passing Score Means
BONENT reports results on a scaled score of 1 to 100, and the passing score is 70. This is a scaled score, so it should not be read as a verified requirement to answer 70% of questions correctly. Scaling accounts for differences in difficulty between exam forms. For more on how to interpret this, read our breakdown of the CPDN passing score, and for realistic expectations about challenge level, see how hard the CPDN exam is.
The Four Exam Domains
The domain weights below come from BONENT's Certified Peritoneal Dialysis Nurse - Detail of Examination Content, the currently linked, undated CPDN examination outline. These are formal examination objectives with official weights; they are not a suggested study-time allocation, though they tell you where the exam's points live.
| Domain | 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 core of the exam. It covers the clinical work of caring for PD patients, organized around the nursing process: assessing, planning, implementing, and evaluating care.
- Patient assessment, including recognizing complications and changes in status
- Peritoneal dialysis modalities and prescriptions at the level a bedside nurse must understand
- Catheter care, exit-site assessment, and infection-related concerns
- Interpreting findings and responding appropriately within your scope
Domain 2: Administration (10%)
This domain addresses the program and operations side of PD nursing.
- How a PD program functions within an ESRD facility
- Documentation, quality, and regulatory awareness
- Coordination with the interdisciplinary care team
Domain 3: Education (20%)
PD is a home therapy, so patient and caregiver training is central to the nurse's role, and the exam weights it accordingly at one-fifth of the blueprint.
- Teaching patients and families to perform therapy safely
- Assessing learning needs and evaluating whether teaching worked
- Reinforcing technique and addressing problems that arise at home
Domain 4: Professional Development (10%)
This domain covers your growth and conduct as a nephrology nurse.
- Professional standards and ethical practice
- Continuing education and staying current in the specialty
- Your role in advancing quality and practice
For a deeper treatment of each content area, see our complete guide to all four CPDN exam domains.
Key Takeaway
Nursing Process plus Education together account for 80% of the blueprint. A candidate who is strong clinically but weak on teaching principles is leaving a fifth of the exam to chance.
Applying, Fees, and Test-Day Rules
United States Examination Fees
| Delivery Method | Fee |
|---|---|
| Paper-and-pencil | $235 |
| Computer-based testing (CBT) | $255 |
These are the U.S. examination fees listed on BONENT's eligibility and fees page as of the check date for this article. Fees can change, so verify before you pay. Our CPDN certification cost breakdown adds the ongoing maintenance costs to the picture.
Exam-Day Rules
The CPDN is a closed-book examination. Expect to present your confirmation documents and approved identification. Personal books, calculators, and electronic devices are prohibited. Review BONENT's day-of-exam page and its Candidate Handbook before your date so nothing about check-in surprises you. If you are still working out timing, our CPDN exam dates and scheduling guide explains how to plan around the available windows.
Keeping the Credential: Four-Year Renewal
CPDN certification renews every four years. Under the 2026 Recertification Booklet (effective January 1, 2026), the standard continuing-education route requires:
- 40 contact hours in total
- Of those, at least 30 nephrology-related Group A hours
Two alternatives exist: you can retake the examination, or use BONENT's once-in-a-lifetime continuing-education waiver. Maintenance fees remain payable even if you use the waiver.
Maintenance Costs
| Option | Cost |
|---|---|
| Annual maintenance | $65 per year |
| Four years prepaid | $240 |
Routine recertification carries no additional processing fee when you have satisfied the maintenance requirements. The exception is the examination route, which requires its own examination fee. Prepaying four years costs $240 versus $260 for four annual payments at $65, so prepaying is the cheaper option if your finances allow.
Where the Credential Fits in Your Career
PD nurses work primarily in ESRD facilities and dialysis programs, which is also where the eligibility rules point: active ESRD facility participation is a prerequisite. Certification is relevant if you work in a home dialysis or PD program, if you train patients, or if you want documented proof of specialty competence on your resume.
Whether the credential changes your pay or opportunities depends on your employer and region, and we avoid quoting figures we can't source. For discussion of earnings and the broader return, see our CPDN salary guide, the analysis of whether the certification is worth it, and our overview of CPDN jobs.
Sequencing Your Preparation Around the Blueprint
Rather than a generic study schedule, order your preparation by what the blueprint rewards. Here is one way to sequence an eight-week plan, adjusted to the domain weights. Adapt the pacing to your own experience and exam date.
Domain 1: Nursing Process
- Spend half your total preparation time here, since it carries 60% of the exam
- Work through assessment, modalities, catheter and exit-site care, and complication recognition
- Practice applying the nursing process to short scenarios, not just recalling facts
Domain 3: Education
- Review patient and caregiver training principles for home therapy
- Practice questions that ask what to teach, when, and how to confirm understanding
Domains 2 and 4: Administration and Professional Development
- Cover program operations, documentation, and quality topics
- Review professional standards and continuing-education expectations
Full-length practice under exam conditions
- Simulate 150 questions in 3 hours, closed book, no devices
- Review misses by domain and revisit the weakest one
Put your highest-yield practice into timed question sets so the exam format feels familiar. Our CPDN practice test mirrors the multiple-choice style and lets you track performance by domain. For a structured approach, follow our CPDN study guide, and keep the CPDN cheat sheet handy for last-week review. You can also try more practice questions as you approach your test date.
Frequently Asked Questions
CPDN stands for Certified Peritoneal Dialysis Nurse. The credential is issued through the Board of Nephrology Examiners Nursing and Technology (BONENT) after a candidate meets experience requirements and passes the examination.
The exam contains 150 multiple-choice questions with a 3-hour time limit. It is closed book, and personal books, calculators, and electronic devices are not allowed.
A scaled score of 70 on a 1-100 scale. This is a scaled score, so it is not a verified requirement of 70% raw correct answers.
Nursing Process, at 60% of the exam. Education follows at 20%, while Administration and Professional Development are each 10%.
Certification renews every four years. The standard route requires 40 contact hours, including at least 30 nephrology-related Group A hours. Retaking the exam or using a once-in-a-lifetime continuing-education waiver are alternatives, and maintenance fees ($65 annually or $240 for four years prepaid) still apply.
Understanding exactly what the CPDN is, who qualifies, how the exam is built, and what it takes to keep the credential lets you plan your path deliberately. For more definitions and background, see our pages on what CPDN certification is and the CPDN pass rate, then use the CPDN Exam Prep practice tests to turn that knowledge into exam-day confidence.