- What the CPDN Credential Actually Is
- The Two Eligibility Routes: RN and LPN/LVN
- Counting Your Nephrology Experience
- The Unemployed Applicant Exception
- Reference Requirements
- Application and Exam Fees
- Exam Format and Delivery Options
- What You Must Know: The Four Exam Domains
- Exam-Day Rules and Required Documents
- Keeping the Credential: Renewal Requirements
- Aligning Prep With the Blueprint
- Frequently Asked Questions
- The RN route requires a valid license, at least one year of nephrology experience, and active participation in an ESRD facility.
- The LPN/LVN route requires a valid license, at least two years of nephrology experience, and active ESRD participation.
- Applications need two signed, dated references: your immediate supervisor and another nephrology professional.
- U.S. fees are $235 for paper testing and $255 for computer-based testing; CBT candidates must test within six months of confirmation.
What the CPDN Credential Actually Is
The Certified Peritoneal Dialysis Nurse (CPDN) credential is issued by the Board of Nephrology Examiners Nursing and Technology (BONENT). It validates that a nurse working in peritoneal dialysis has the knowledge to deliver safe, patient-centered care across the full scope of home dialysis nursing. It is a nursing credential, and it is separate from BONENT's technician certification examinations and from other dialysis-nursing credentials. If you are still orienting yourself, our explainers on what CPDN certification is and what CPDN stands for cover the basics.
Before you spend money or schedule anything, the first question is simple: do you qualify? This guide walks through each eligibility requirement, the paperwork BONENT expects, the fee structure, and what happens after you pass. Requirements and fees change, so always confirm against BONENT's current eligibility and fees page before submitting an application.
The Two Eligibility Routes: RN and LPN/LVN
BONENT sets different experience thresholds depending on your license type. Both routes share three core elements: a valid nursing license, hands-on nephrology experience, and active participation in an End-Stage Renal Disease (ESRD) facility.
| Requirement | RN Route | LPN/LVN Route |
|---|---|---|
| Nursing license | Valid RN license | Valid LPN/LVN license |
| Nephrology experience | At least 1 year | At least 2 years |
| ESRD facility participation | Active participation required | Active participation required |
| References | Two signed, dated references | Two signed, dated references |
Notice that the LPN/LVN route asks for twice the nephrology experience. That difference reflects the scope-of-practice gap between the two licenses, and it is the single most common point of confusion among applicants. If you are an LPN/LVN with 18 months of nephrology experience, you are not yet eligible, even though an RN colleague with the same tenure would be.
Counting Your Nephrology Experience
The experience requirement is where applications most often stall. "Nephrology experience" means work in the care of patients with kidney disease, and for a CPDN candidate that usually means dialysis nursing in a clinic, a home training program, or a hospital-based dialysis service. Time spent in unrelated specialties generally will not count toward the threshold, even if you worked in a medical-surgical setting that occasionally saw renal patients.
Experience that typically strengthens your application
- Home dialysis training: teaching patients and caregivers PD exchanges, cycler operation, and aseptic technique
- Peritoneal dialysis clinic nursing: prescription monitoring, adequacy follow-up, and complication assessment
- Catheter exit-site assessment and peritonitis surveillance in a dialysis program
- Hemodialysis or acute dialysis experience in an ESRD-participating facility, which still counts as nephrology experience
Why the "active participation" language matters
BONENT does not just ask whether you have been near dialysis. It asks that you actively participate in an ESRD facility. In practice, this means you are currently engaged in the delivery of care within a dialysis setting rather than only holding past experience. Your supervisor's reference is the main way BONENT verifies this, which is why choosing the right reference matters (covered below).
The Unemployed Applicant Exception
Careers have gaps. BONENT publishes an exception for qualifying unemployed applicants: if you are not currently employed, you may document your experience through your immediate past supervisor rather than a current one. This keeps nurses who have been laid off, relocated, or taken a break from being locked out of certification.
Read BONENT's published language on this exception carefully, since "qualifying" is doing real work in that phrase. If your situation is ambiguous, ask BONENT directly before paying a fee.
Reference Requirements
Every application requires two signed, dated references:
- Your immediate supervisor (or your immediate past supervisor if you qualify under the unemployed exception)
- Another nephrology professional who can speak to your competence in the field
Both must be signed and dated. An unsigned or undated form is a common reason for processing delays. Choose references who know your clinical work firsthand. A charge nurse, nephrologist, nurse manager, or experienced dialysis colleague can all be reasonable choices for the second reference, provided they are genuinely part of the nephrology community and can vouch for your practice.
Key Takeaway
Send your references the blank forms and a short note with your deadline at least a few weeks before you intend to apply. Busy supervisors are the most common cause of avoidable delays, not eligibility itself.
Application and Exam Fees
BONENT's current United States examination fees are:
| Testing Method | U.S. Exam Fee |
|---|---|
| Paper-and-pencil | $235 |
| Computer-based testing (CBT) | $255 |
Older BONENT materials, including the Candidate Handbook revised in January 2021, may list different prices. The current fees page supersedes the handbook, so trust the live fee schedule over any PDF you downloaded years ago. For the full cost picture, including renewal and maintenance, see our CPDN certification cost breakdown.
Budgeting beyond the exam fee
The exam fee is only the entry cost. Plan for study materials, any travel to a testing center if you choose CBT, and the annual maintenance fee that begins once you are certified (detailed in the renewal section). Weighing these expenses against career benefits is the subject of our ROI analysis and salary guide.
Exam Format and Delivery Options
Once your application is approved, you choose how to sit the exam. The test itself is the same: 150 multiple-choice questions with 3 hours allowed.
- Paper-and-pencil: offered on BONENT's scheduled paper testing dates
- Computer-based testing: delivered at approved centers, with BONENT's official CBT center directory hosted at smttest.com
CBT candidates must test within six months of their confirmation letter. Treat that letter as a ticking clock: schedule your seat promptly and avoid letting the window lapse. The CBT interface permits you to review questions and change answers, so you can flag uncertain items and return to them. For scheduling specifics, see our guide to CPDN exam dates and testing windows.
How scoring works
Passing requires a scaled score of 70 on a 1-100 scale. This is not the same as answering 70% of questions correctly, because scaled scoring adjusts for the difficulty of the specific exam form. Do not budget your prep around "I can miss 45 questions." Our passing score explainer unpacks this distinction, and our look at exam difficulty and the pass rate data adds context.
What You Must Know: The Four Exam Domains
Eligibility gets you into the room, but the content outline determines whether you pass. BONENT's examination content outline lists four domains with official weights. These are formal exam objectives, not a suggested study schedule, so use them to decide where depth matters most.
| 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 heart of the exam. Expect scenario-based questions that require you to assess, plan, implement, and evaluate care for peritoneal dialysis patients.
- Assessing patients on PD, including volume status, adequacy, and nutrition
- Recognizing and responding to complications such as peritonitis, exit-site infection, and catheter malfunction
- Interpreting prescriptions and making sense of exchange schedules and cycler settings
- Applying aseptic technique and infection-prevention principles
Domain 2: Administration (10%)
A smaller but real slice covering program-level responsibilities and regulatory awareness.
- Documentation, quality assurance, and facility-level standards
- Safety, compliance, and appropriate delegation within a dialysis program
Domain 3: Education (20%)
PD is a self-care therapy, so patient and caregiver teaching carries serious weight.
- Training patients and caregivers in home dialysis technique
- Adapting teaching to learning needs, literacy, and readiness
- Reinforcing infection-prevention behaviors and troubleshooting at home
Domain 4: Professional Development (10%)
Covers your growth and standards of practice as a dialysis nurse.
- Scope of practice, ethics, and continuing competence
- Evidence-based practice and professional responsibility
For a deeper treatment of each area, read our complete guide to the four CPDN content areas, and keep our one-page cheat sheet handy for last-minute review.
Exam-Day Rules and Required Documents
The CPDN exam is closed book. You will need your confirmation documents and approved identification. Personal books, calculators, and electronic devices are prohibited in the testing area. Read BONENT's day-of-exam page and the Candidate Handbook ahead of time so there are no surprises at check-in, remembering that the handbook's older fee figures have been superseded even though its testing-procedure guidance remains a useful reference.
Keeping the Credential: Renewal Requirements
Certification renews every four years. Under the 2026 Recertification Booklet (effective January 1, 2026), you have three paths:
- Continuing education: 40 contact hours, including at least 30 nephrology-related Group A hours
- Re-examination: retake the exam to recertify
- Once-in-a-lifetime CE waiver: an alternative continuing-education waiver option
Maintenance fees
| Maintenance Option | Cost |
|---|---|
| Annual maintenance | $65 per year |
| Four years prepaid | $240 |
Maintenance fees remain payable even under the waiver. Routine recertification carries no additional processing fee when your maintenance requirements are satisfied, though the examination route does require the exam fee. Prepaying four years ($240) costs less than four annual payments ($260), so it is worth considering if you plan to stay certified.
Aligning Prep With the Blueprint
One short note on study structure: let the domain weights drive your calendar. Because Nursing Process is 60% of the exam, most of your time belongs there, and Education at 20% deserves the second-largest share. A simple allocation looks like this:
Nursing Process foundations
- Assessment, complications, and peritonitis management
- Prescription interpretation and aseptic technique
Education
- Patient and caregiver training principles for home therapy
Administration and Professional Development
- Documentation, quality, scope of practice, and ethics
Full-length practice
- Timed 150-question sets under the 3-hour limit, then targeted review
Our CPDN study guide expands this into a full plan, and you can test yourself against exam-style questions on our CPDN practice test platform. If you want structured learning before you apply, see our overview of CPDN training, and if you are weighing where the credential can take you, browse our notes on CPDN jobs.
Frequently Asked Questions
RNs need at least one year of nephrology experience, and LPN/LVNs need at least two years. Both must hold a valid license and be actively participating in an ESRD facility.
Qualifying unemployed applicants may document their experience through their immediate past supervisor under BONENT's published exception. You still need two signed, dated references, so contact your former supervisor early.
In the United States, the fee is $235 for paper testing and $255 for computer-based testing. Check BONENT's current fees page before paying, since it supersedes older handbook pricing.
CBT candidates must test within six months of their confirmation letter. Schedule early so you do not risk losing your approval window.
No. The passing standard is a scaled score of 70 on a 1-100 scale, which is not a verified 70% raw-score threshold. The exam has 150 multiple-choice questions and allows 3 hours.
Meeting the CPDN requirements is mostly a matter of documentation and timing: confirm your license, verify your experience hits the one-year (RN) or two-year (LPN/LVN) mark, secure two signed references, and choose your testing method. Once you are approved, direct your preparation toward Nursing Process and Education, where 80% of the exam lives, and you will be studying where it counts.