- The One-Page Snapshot: Exam Facts at a Glance
- Eligibility Gates You Must Clear First
- Fees, Permits, and Test-Day Rules
- Blueprint Math: Where the Points Live
- Kidney Replacement Therapies: The 54-56% Block
- CKD Stages 3 Through 5 and Early-Stage Review
- Acute Kidney Injury and Cross-Cutting Objectives
- What the Questions Reward
- Sequencing Your Review by Domain Weight
- After You Pass: Renewal and Career Context
- Frequently Asked Questions
- The exam has 175 multiple-choice questions in 4 hours, with about 25 unscored pilot items; the passing standard score is 95 (70% correct).
- Kidney Replacement Therapies carries 54-56% of the blueprint, so it deserves more than half of your review time.
- Eligibility requires 2,000 nephrology NP hours, 2 years of practice, and 20 approved nephrology CE hours within the preceding 2 years.
- Standard fee is $375 ($350 for qualifying ANNA, ASN, NKF, or NOVA members); a reduced-fee retake within one year is $250/$225.
The One-Page Snapshot: Exam Facts at a Glance
The Certified Nephrology Nurse - Nurse Practitioner (CNN-NP) credential is offered by the Nephrology Nursing Certification Commission (NNCC). The exam is administered through C-NET with PSI computer-based test-center delivery. This cheat sheet condenses what NNCC publishes into one scannable reference, then points you toward deeper guides when you need more detail.
| Item | What to Know |
|---|---|
| Certifying body | Nephrology Nursing Certification Commission (NNCC) |
| Delivery | C-NET administration, PSI computer-based test centers |
| Format | 175 multiple-choice questions, 4 hours |
| Unscored items | Approximately 25 pilot items (not identifiable) |
| Passing standard | Standard score of 95, described by NNCC as 70% correct |
| Reference materials | Closed book |
| Identification | Matching government-issued photo ID plus a 90-day testing permit |
| Credential length | 5 years |
For a closer look at the scoring threshold, see CNN-NP Passing Score 2026: Exactly What You Need to Pass. For the scheduling side, CNN-NP Exam Dates 2026: Testing Windows, Deadlines & Scheduling covers the logistics.
Eligibility Gates You Must Clear First
The CNN-NP is not an entry-level credential. NNCC expects an experienced nephrology NP, and the application checks every item below. Missing one means no testing permit, regardless of how well you know the content.
- Licensure: an unrestricted U.S. or territorial RN license.
- National NP certification: you must already hold one.
- Education: a master's degree in nursing.
- Practice: both 2,000 hours and 2 years of nephrology NP practice within the preceding 2 years.
- Continuing education: 20 approved nephrology CE contact hours within the preceding 2 years.
The "within the preceding 2 years" language applies to the practice and CE requirements, so a stale CE certificate or a long gap away from nephrology practice can derail an application. The full breakdown lives in CNN-NP Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Fees, Permits, and Test-Day Rules
| Fee Type | Standard | Qualifying Member (ANNA, ASN, NKF, NOVA) |
|---|---|---|
| Initial exam | $375 | $350 |
| Reduced-fee retake (within one year) | $250 | $225 |
| 5-year CE renewal | $300 | $275 |
| Official practice test (50 questions, 90-day access) | $50, or free after exam approval | Same |
Two cost-saving moves are worth noting. First, if you belong to one of the four partner organizations, the discount applies to the exam, the retake, and renewal. Second, the official practice test is free once your exam application is approved, so it is worth waiting to take it until then unless you want an early baseline. For a full budget view, read CNN-NP Certification Cost 2026: Complete Pricing Breakdown.
Blueprint Math: Where the Points Live
The domain ranges below reproduce the official April 2018 blueprint revision, implemented July 2019, as presented in NNCC's linked preparation guide. Older outlines floating around online conflict with it, and this site does not claim a newly verified 2026 blueprint. Always check the preparation guide linked from NNCC's certification page for the current version.
| Domain | Weight | Approx. Scored Items (of 150) |
|---|---|---|
| 1. Acute Kidney Injury | 6-8% | Roughly 9-12 |
| 2. Stages 1 & 2 CKD & General Nephrology | 4-6% | Roughly 6-9 |
| 3. Stage 3 CKD | 11-13% | Roughly 17-20 |
| 4. Stages 4 & 5 CKD | 20-22% | Roughly 30-33 |
| 5. Kidney Replacement Therapies | 54-56% | Roughly 81-84 |
The item counts are simple arithmetic: the weight range applied to the roughly 150 scored questions that remain after the approximately 25 pilot items are set aside. They are estimates for planning, not published counts. The takeaway is clear: Domains 4 and 5 together account for roughly three-quarters or more of the exam. A domain-by-domain walkthrough is in CNN-NP Exam Domains 2026: Complete Guide to All 5 Content Areas.
Kidney Replacement Therapies: The 54-56% Block
Kidney Replacement Therapies (KRT) is the largest area in the selected matrix by a wide margin. It is where most nephrology NPs spend their clinical day, and the exam reflects that. Expect questions that ask you to manage patients on therapy, not just recognize definitions.
Domain 5: Kidney Replacement Therapies (54-56%)
This domain spans the modalities that replace kidney function and the NP's role in selecting, prescribing, monitoring, and troubleshooting them.
- Modality selection and education: matching hemodialysis, peritoneal dialysis, home therapies, and transplant pathways to patient clinical status, preferences, and psychosocial circumstances.
- Prescribing: dialysis prescription elements and how to adjust them in response to labs, symptoms, and adequacy measures.
- Vascular and peritoneal access: evaluating function, recognizing complications, and knowing when to refer.
- Complications: intradialytic and interdialytic problems, infection, volume and blood pressure management, and electrolyte disturbances.
- Dialysis-related disease management: anemia, mineral and bone disorder, nutrition, and medication dosing adjusted for kidney replacement.
- Transplant care: evaluation, referral, and follow-up concepts relevant to the NP role.
- Conservative and supportive care: shared decision-making, symptom management, and decisions about starting or stopping therapy.
Key Takeaway
If your daily practice is outpatient CKD clinic, KRT may be your weakest area even though it is the most heavily tested. Audit yourself honestly: dialysis prescription and complication management questions are scenario-driven, and exposure matters more than memorization.
CKD Stages 3 Through 5 and Early-Stage Review
The three CKD domains together make up roughly 35-41% of the blueprint, with Stages 4 & 5 CKD (20-22%) the heaviest among them.
Domain 4: Stages 4 & 5 CKD (20-22%)
This is the pre-replacement-therapy domain: preparing patients for what comes next while managing advanced disease complications.
- Complications of advanced CKD: anemia, mineral and bone disorder, acidosis, hyperkalemia, volume overload.
- Timing and preparation for kidney replacement therapy, including access planning and modality education.
- Medication review and dose adjustment for reduced kidney function.
- Decision-making around conservative management versus initiating therapy.
Domain 3: Stage 3 CKD (11-13%)
Focus on slowing progression and managing the first wave of complications.
- Progression risk factors and monitoring strategy.
- Blood pressure, proteinuria, and glycemic management in the context of kidney disease.
- Early detection and treatment of anemia and mineral metabolism changes.
- Safe prescribing and avoidance of nephrotoxins.
Domain 2: Stages 1 & 2 CKD & General Nephrology (4-6%)
The smallest domain, but one that includes breadth across general nephrology.
- Identifying kidney damage with preserved function: albuminuria, hematuria, structural abnormalities.
- Risk-factor modification and screening populations at higher risk.
- General nephrology topics such as glomerular disease presentations, electrolyte and acid-base problems, and hypertension, at a recognition and initial-management level.
The progression across these domains is a useful way to organize your review: what you do at stage 2 sets up what you manage at stage 3, and so on. For a plan that builds on this progression, see CNN-NP Study Guide 2026: How to Pass on Your First Attempt.
Acute Kidney Injury and Cross-Cutting Objectives
Domain 1: Acute Kidney Injury (6-8%)
Small by weight, but the questions tend to be clinical reasoning puzzles that reward a systematic approach.
- Differentiating prerenal, intrinsic, and postrenal causes from history, exam, and laboratory data.
- Identifying and removing precipitating factors, including medications and contrast exposure.
- Recognizing indications that an AKI patient may need kidney replacement therapy.
- Follow-up after recovery, since AKI is a risk factor for later CKD.
NNCC also describes cross-cutting objectives that apply across all five domains. Do not study these separately; recognize that any question, in any domain, may test them:
- Assessment and diagnosis: interpreting findings and forming a differential.
- Prescribing interventions: choosing and adjusting medications and therapies safely for reduced kidney function.
- Patient and family education: teaching that matches health literacy and treatment choices.
- Interdisciplinary care: knowing when to involve dietitians, social workers, surgeons, transplant teams, and others.
- Holistic planning: integrating psychosocial needs, goals of care, and quality of life into the plan.
What the Questions Reward
All 175 items are multiple choice, and NNCC's description of the exam emphasizes NP-level practice rather than recall of isolated facts. Because roughly 25 items are unscored pilot questions that you cannot identify, treat every question as if it counts and avoid spending extra time hunting for "the weird one."
- Scenario stems: expect a patient with a history, findings, and sometimes lab values, followed by a question about the best next step, most likely cause, or most appropriate intervention.
- Best-answer logic: several options may be reasonable; the correct one is the most appropriate for the described patient and the NP scope.
- Weighted toward management: with KRT and advanced CKD dominating, many items ask what to prescribe, adjust, order, or teach.
- Safety signals: watch for stems that hint at medication dosing hazards, infection risk, or unstable volume and electrolyte status.
Sequencing Your Review by Domain Weight
Rather than a generic template, tie your calendar to the blueprint. The logic: start with the heaviest, hardest-to-cram domain, keep it in rotation to the end, and use the smaller domains as shorter modules. Adjust the number of weeks to your own timeline and your testing permit window.
Kidney Replacement Therapies, first pass
- Modality selection, dialysis prescription, and access concepts.
- Complications and medication adjustment during replacement therapy.
- Log every weak topic for the revisit weeks.
Stages 4 & 5 CKD
- Advanced CKD complications and preparation for replacement therapy.
- Conservative management and decision-making discussions.
Stage 3 CKD and Stages 1 & 2 / General Nephrology
- Progression management, proteinuria, and early complications.
- Recognition-level review of general nephrology topics.
Acute Kidney Injury plus cross-cutting objectives
- Causes, workup, and replacement therapy indications.
- Education, prescribing safety, and interdisciplinary referral scenarios.
Second KRT pass and timed practice
- Revisit logged weak spots, weighted toward Domain 5.
- Timed mixed sets and the official 50-question practice test.
Are you wondering whether the effort pays off professionally? Is the CNN-NP Certification Worth It? Complete ROI Analysis 2026 weighs the investment.
After You Pass: Renewal and Career Context
The credential is valid for 5 years. NNCC's CE renewal route requires that you maintain your RN and NP credentials, document 1,000 nephrology NP practice hours, and complete 75 approved CE hours within the 5-year period. The renewal fee is $300 standard or $275 for partner members. Taking the examination again is an alternative to the CE route for earning renewal, but it does not replace the practice and credential requirements.
Key Takeaway
Start logging nephrology NP practice hours and approved CE the day you certify. Waiting until year five to reconstruct 1,000 hours and 75 CE hours is a preventable headache.
Employers that value this credential are those that put NPs in nephrology roles: dialysis organizations, nephrology practices, hospital kidney programs, and transplant-related services. For openings and what to expect, see CNN-NP Jobs, and for compensation context, CNN-NP Salary Guide 2026: Complete Earnings Analysis. If you are still sorting out the terminology, What Is CNN-NP? offers a primer, and the broader CNN-NP Certification overview covers the credential as a whole.
Frequently Asked Questions
The exam has 175 multiple-choice questions with a 4-hour time limit, per NNCC's live certification page. About 25 of the items are unscored pilot questions, and they are not identified, so answer every question carefully. Note that the January 2026 application contains a conflicting duration, so confirm details on your testing permit.
The passing standard score is 95, which NNCC describes as 70% correct. Scores are reported on a standard scale, so focus on broad competence across the blueprint rather than trying to calculate an exact number of questions to answer correctly.
Kidney Replacement Therapies, at 54-56% of the blueprint, is by far the largest. Stages 4 & 5 CKD (20-22%) is second. Together they dominate the exam, so weak performance there is very difficult to offset with strength in the smaller domains.
The exam is $375 standard or $350 for qualifying ANNA, ASN, NKF, or NOVA members. A reduced-fee retake within one year is $250, or $225 for qualifying members. The official 50-question practice test costs $50 or is free after your exam application is approved.
Examination is an alternative to the CE renewal route, but it is not an alternative to maintaining your RN and NP credentials or meeting practice requirements. The CE route requires 1,000 nephrology NP practice hours and 75 approved CE hours within the 5-year certification period.
For further reading, the comparative view in CNN-NP Pass Rate 2026: What the Data Shows and a fresh round of questions on the CNN-NP practice exam are logical next steps.