- The Passing Score in One Sentence
- Why "70" Is Not "70 Percent"
- The Test Behind the Score: 150 Questions, 3 Hours
- How the Four Domains Shape Your Result
- Getting to the Exam: Eligibility, References and Fees
- Exam-Day Rules That Protect Your Score
- Building a Study Plan Around the Blueprint
- After You Pass: Renewal and Maintenance
- Frequently Asked Questions
- The Certified Peritoneal Dialysis Nurse exam requires a scaled score of 70 on a 1-100 scale.
- A scaled 70 is not a verified 70% raw-score cutoff, so avoid planning around raw percentages.
- The exam has 150 multiple-choice questions and a 3-hour limit, with answer review and changes permitted.
- Nursing Process carries 60% of the blueprint, so most of your score is decided there.
The Passing Score in One Sentence
To earn the Certified Peritoneal Dialysis Nurse (CPDN) credential from the Board of Nephrology Examiners Nursing and Technology (BONENT), you need a scaled score of 70 on a 1-100 scale. That single number is what separates a pass from a retest, and it is worth understanding precisely, because a lot of candidates misread it.
If you are still orienting yourself to the credential itself, the overview pages What Is CPDN Certification? and What Does CPDN Stand For? cover the basics. This article focuses narrowly on the score: what it means, how the exam is built around it, and how to prepare so that you clear it with margin.
Why "70" Is Not "70 Percent"
The most common misunderstanding about the CPDN passing score is treating it as a raw percentage. BONENT reports a scaled score, and the 70 is a point on a 1-100 reporting scale. It has not been verified as a 70% raw-score threshold, which means you cannot safely convert it into "I need to answer 105 of 150 questions correctly."
What a scaled score is designed to do
Scaled scoring exists so that a given reported score represents the same level of competence regardless of which question set a candidate received. Different forms of an exam can vary slightly in difficulty, and scaling adjusts for that so results remain comparable. The practical consequence for you is straightforward: the raw count of correct answers needed to reach a scaled 70 is not something you should assume or try to reverse-engineer.
What to do instead of calculating a cutoff
- Aim for consistent mastery across the blueprint rather than a minimum number of right answers.
- Treat every practice question as a chance to learn the underlying concept, not to count toward a target.
- Be skeptical of any third-party claim that states an exact number of questions you can miss.
For a candid look at how demanding the test feels in practice, see How Hard Is the CPDN Exam? Complete Difficulty Guide 2026. And because published pass-rate numbers are frequently misquoted online, CPDN Pass Rate 2026: What the Data Shows explains what can and cannot be said responsibly.
Key Takeaway
Plan for competence, not for a raw percentage. The only officially stated figure is a scaled 70 on a 1-100 scale, so build your preparation around covering every domain well rather than gaming a cutoff.
The Test Behind the Score: 150 Questions, 3 Hours
The CPDN examination contains 150 multiple-choice questions and allows 3 hours. That works out to roughly one minute and twelve seconds per question if you spend the entire time evenly, which is comfortable for most well-prepared nurses but tight if you stall on scenario-heavy items.
Paper or computer-based testing
BONENT offers two delivery methods: paper-and-pencil testing and center-based computer-based testing (CBT). The official CBT center directory is hosted at smttest.com. The content and passing standard are the same either way; the choice is about logistics and comfort.
| Feature | Paper-and-Pencil | Computer-Based (CBT) |
|---|---|---|
| United States exam fee | $235 | $255 |
| Number of questions | 150 multiple choice | 150 multiple choice |
| Time allowed | 3 hours | 3 hours |
| Passing standard | Scaled score of 70 (1-100 scale) | Scaled score of 70 (1-100 scale) |
| Delivery | Paper and pencil | Test center |
| Scheduling window | Per published testing dates | Within six months of confirmation letter |
On the CBT version, the testing interface permits you to review questions and change answers before you submit. That matters for pacing strategy: you can move steadily through the exam, flag items you are unsure of, and return to them with whatever time remains. For scheduling specifics, CPDN Exam Dates 2026: Testing Windows, Deadlines & Scheduling walks through the timing.
What the question style asks of you
Because every item is multiple choice and the largest domain is Nursing Process, expect questions that put you in the role of a peritoneal dialysis nurse making a clinical judgment. You are being tested on applied reasoning: recognizing a complication, choosing the appropriate nursing action, and identifying what a patient needs to be taught. Recall of isolated facts is only part of it.
How the Four Domains Shape Your Result
The exam is built from four formal examination objectives, each with an official weight. These weights come from BONENT's Certified Peritoneal Dialysis Nurse - Detail of Examination Content, the currently linked undated CPDN examination outline. They describe how the exam is constructed, not how you should divide your study hours, though they obviously inform both.
| Domain | Weight | Why It Matters for Your Score |
|---|---|---|
| Domain 1: Nursing Process | 60% | The bulk of the exam; weakness here is very hard to offset |
| Domain 2: Administration | 10% | Smaller share, but concentrated and often overlooked |
| Domain 3: Education | 20% | Second-largest area; patient and family teaching is central to PD |
| Domain 4: Professional Development | 10% | Smaller share, yet quick to master with focused review |
Domain 1: Nursing Process (60%)
This is the heart of the exam. It covers the clinical work of caring for a peritoneal dialysis patient across the nursing process: assessment, planning, intervention and evaluation as they apply to PD.
- Assessing the patient and the dialysis access and recognizing abnormal findings
- Responding to PD-related complications and knowing the appropriate nursing action
- Understanding prescriptions, exchanges and how therapy is delivered and monitored
- Evaluating outcomes and adjusting the plan of care
Domain 3: Education (20%)
Peritoneal dialysis is a home therapy, so patient and caregiver teaching is not a side topic. This domain tests whether you can teach safely and effectively.
- Training patients and caregivers to perform therapy correctly
- Teaching infection-prevention habits and when to call the clinic
- Adapting teaching to the learner and verifying understanding
Domains 2 and 4: Administration and Professional Development (10% each)
Together these make up a fifth of the exam. They are easier to prepare for than the clinical domains but are exactly where under-prepared candidates drop points.
- Administration: program operations, policies, quality and regulatory expectations
- Professional Development: scope of practice, ongoing learning and professional responsibility
For a complete walk-through of each content area, read CPDN Exam Domains 2026: Complete Guide to All 4 Content Areas.
Getting to the Exam: Eligibility, References and Fees
You cannot simply sit for the exam; you must first qualify. The standard routes depend on your license type and nephrology experience.
| Requirement | RN Route | LPN/LVN Route |
|---|---|---|
| Licensure | Valid nursing license | Valid license |
| Nephrology experience | At least one year | At least two years |
| ESRD participation | Active participation in an ESRD facility | Active participation in an ESRD facility |
Documentation and references
- Applications require 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 experience through their immediate past supervisor.
- CBT candidates must test within six months of their confirmation letter, so do not apply until you are close to ready.
The full eligibility picture is covered in CPDN Requirements 2026: Eligibility, Prerequisites & How to Qualify.
What the exam costs
In the United States, the fee is $235 for paper testing and $255 for CBT. Because a retest means paying again, the cost of an unprepared first attempt is real. For the broader financial picture including maintenance, see CPDN Certification Cost 2026: Complete Pricing Breakdown. Always confirm current figures on BONENT's eligibility and fees page, since current fee pages supersede older handbook prices.
Exam-Day Rules That Protect Your Score
Preventable problems on exam day can derail a score you earned through months of study. The test is closed book, and BONENT sets firm rules about what you may bring.
- Bring your confirmation documents and approved identification.
- Personal books are not permitted.
- Calculators are not permitted.
- Electronic devices are not permitted.
Because no calculator is allowed, be comfortable doing any simple arithmetic by hand during practice. Rehearse under the same conditions you will face: no notes, no devices, and a hard 3-hour limit across 150 items.
Key Takeaway
Check the exam-day rules on BONENT's day-of-exam page before your test date, and verify that your identification matches your confirmation documents. Do this a week early, not the morning of.
Building a Study Plan Around the Blueprint
Since the weights are published, you can sequence your preparation so the heaviest domains get the earliest and deepest attention. The plan below is one example for a candidate with several weeks available; adjust it to your own clinical strengths.
Baseline and Nursing Process foundations
- Take a diagnostic set of practice questions to find weak areas
- Begin Domain 1 review: PD assessment, access care and therapy delivery
Nursing Process depth
- Work through complication recognition and nursing responses
- Practice scenario questions and explain each answer to yourself
Education (Domain 3)
- Review patient and caregiver teaching content and infection prevention
- Practice questions on adapting teaching and confirming understanding
Administration and Professional Development
- Cover Domains 2 and 4 together; they are compact and quick to consolidate
- Start timed mixed sets across all four domains
Full-length simulation and gap repair
- Complete a timed 150-question run within 3 hours, closed book
- Return to any domain where you consistently miss questions
The reasoning is simple: Nursing Process and Education together account for 80% of the exam, so they come first and take the most time. Administration and Professional Development are smaller, so they slot in later but still need real attention. For a fuller method, see CPDN Study Guide 2026: How to Pass on Your First Attempt, and for a condensed last-minute review, the CPDN Cheat Sheet 2026: One-Page Review of Must-Know Facts is a useful companion.
To practice under realistic conditions, use the CPDN practice tests and focus on explaining why each wrong option is wrong. That habit builds the applied reasoning the exam rewards far better than memorizing answer keys.
After You Pass: Renewal and Maintenance
Passing is the start of an ongoing cycle. Certification renews every four years. Under the 2026 Recertification Booklet, routine renewal requires 40 contact hours, including at least 30 nephrology-related Group A hours. Two alternatives exist: retaking the examination, or a once-in-a-lifetime continuing-education waiver. Maintenance fees remain payable even under the waiver.
| Maintenance Item | Detail |
|---|---|
| Renewal cycle | Every four years |
| Contact hours required | 40, including at least 30 nephrology-related Group A hours |
| Annual maintenance | $65 per year |
| Four years prepaid | $240 |
| Routine recertification processing | No additional fee when maintenance requirements are satisfied |
| Examination route | Requires the examination fee |
If you are weighing whether the credential justifies this ongoing commitment, Is the CPDN Certification Worth It? Complete ROI Analysis 2026 and CPDN Salary Guide 2026: Complete Earnings Analysis look at the career side, and CPDN Jobs covers the settings where certified peritoneal dialysis nurses work.
Frequently Asked Questions
You need a scaled score of 70 on a 1-100 scale. This is a scaled reporting score, not a verified 70% raw-score threshold, so it should not be converted into a specific number of correct answers.
The exam has 150 multiple-choice questions and allows 3 hours. On the computer-based version, the interface permits you to review questions and change answers before finishing.
Nursing Process, which carries 60% of the exam. Education follows at 20%, while Administration and Professional Development each carry 10%. Strong performance in Nursing Process does most of the work toward a passing result.
In the United States, the fee is $235 for paper testing and $255 for computer-based testing. Check BONENT's current eligibility and fees page before applying, as current fee pages supersede older handbook prices.
No. The exam is closed book. Personal books, calculators and electronic devices are prohibited, and you must bring your confirmation documents and approved identification.