- How the CNN-NP Blueprint Is Built
- A Note on the Blueprint Date
- Domain Weights at a Glance
- Domain 1: Acute Kidney Injury
- Domain 2: Stages 1 & 2 CKD & General Nephrology
- Domain 3: Stage 3 CKD
- Domain 4: Stages 4 & 5 CKD
- Domain 5: Kidney Replacement Therapies
- Cross-Cutting Objectives Across All Domains
- Exam Format and Registration Mechanics
- Sequencing Your Preparation by Domain Weight
- Frequently Asked Questions
- The CNN-NP blueprint has five domains, and Kidney Replacement Therapies alone accounts for 54-56% of scored content.
- Stages 4 & 5 CKD is the second-largest domain at 20-22%, so advanced CKD plus KRT covers roughly three-quarters of the exam.
- The exam is 175 multiple-choice questions in 4 hours; about 25 are unscored pilot items.
- The passing standard is a score of 95, which NNCC describes as 70% correct.
How the CNN-NP Blueprint Is Built
The Certified Nephrology Nurse - Nurse Practitioner (CNN-NP) examination is administered by the Nephrology Nursing Certification Commission (NNCC), delivered through C-NET with PSI computer-based test-center delivery. It is a specialty exam for nurse practitioners who already hold national NP certification and are practicing in nephrology. That context shapes everything about the blueprint: the exam does not teach you what an NP does, it tests whether you manage kidney patients at an expert level across the full disease trajectory.
Rather than organizing content by body system or by nursing process, the blueprint follows the clinical course of kidney disease: from acute kidney injury, through early and mid-stage chronic kidney disease, into advanced CKD, and finally into kidney replacement therapies. Understanding this progression is the single most useful mental model for the exam, because it tells you where the points are.
If you are still deciding whether the credential fits your career path, start with What Is CNN-NP Certification? and then return here for the content detail.
A Note on the Blueprint Date
This matters because blueprint-driven study only works when the blueprint is right. Treat the ranges below as the best publicly linked guidance, and cross-check them against the preparation guide you download directly from NNCC.
Domain Weights at a Glance
| Domain | Name | Weight |
|---|---|---|
| 1 | Acute Kidney Injury | 6-8% |
| 2 | Stages 1 & 2 CKD & General Nephrology | 4-6% |
| 3 | Stage 3 CKD | 11-13% |
| 4 | Stages 4 & 5 CKD | 20-22% |
| 5 | Kidney Replacement Therapies | 54-56% |
The distribution is steeply lopsided. Domains 4 and 5 together make up roughly three-quarters of the content, while Domains 1 and 2 combined are only about a tenth to a seventh of it. A candidate who spreads study time evenly across five domains is misallocating effort. The remainder of this guide walks through each domain in the order the blueprint lists them, with the heaviest areas receiving the most detail.
Domain 1: Acute Kidney Injury (6-8%)
Acute kidney injury is the smallest of the "disease-state" domains but it is a high-yield one clinically, and questions here tend to test recognition and first-line decision-making rather than long-term management.
Acute Kidney Injury
Expect scenario questions that ask you to classify the injury, identify the likely cause, and choose the next appropriate step.
- Distinguishing prerenal, intrinsic, and postrenal causes from history, exam, urinalysis, and lab patterns
- Recognizing nephrotoxic exposures (contrast, certain antimicrobials, NSAIDs) and the medication review that follows
- Volume assessment and the decision between fluid resuscitation and fluid restriction
- Electrolyte and acid-base consequences, especially hyperkalemia and metabolic acidosis
- Indications for escalating to renal replacement therapy and when to involve the nephrologist urgently
- Post-AKI follow-up, including the risk of progression to chronic kidney disease
Because AKI sits at the front of the disease timeline, it is also the domain where the exam's cross-cutting objectives of assessment and diagnosis show up most clearly. Plan to spend modest but focused time here: master the diagnostic framework, and you will capture most of this domain's points.
Domain 2: Stages 1 & 2 CKD & General Nephrology (4-6%)
This is the smallest domain, and it combines early-stage CKD with general nephrology topics that do not fit neatly elsewhere. Candidates sometimes under-prepare here precisely because the weight is low, but the questions are usually answerable with solid fundamentals.
Early CKD and General Nephrology
Think screening, risk reduction, and slowing progression before function declines significantly.
- Identifying who should be screened and interpreting albuminuria and eGFR together
- Blood pressure and glycemic management in the context of kidney protection
- Foundations of evaluating hematuria and proteinuria
- Counseling on avoiding nephrotoxins and on lifestyle modification
- Basic fluid, electrolyte, and acid-base principles that apply across nephrology
Do not let the small percentage tempt you to skip it entirely. Early CKD is where the exam's patient-education objective is most visible, and these items can be some of the more approachable points on test day.
Domain 3: Stage 3 CKD (11-13%)
Stage 3 CKD is where complications begin to emerge and where the NP's management skills start to carry real weight. This domain is nearly twice the size of Domains 1 and 2 combined at the low end of its range, so it deserves meaningful study time.
Stage 3 CKD
The emphasis is on recognizing and treating the emerging complications of reduced kidney function.
- Anemia of CKD: evaluation, iron status, and when to consider erythropoiesis-stimulating therapy
- Early mineral and bone disorder: calcium, phosphorus, PTH, and vitamin D considerations
- Cardiovascular risk management, including lipids and blood pressure targets
- Medication dosing adjustments and avoidance of nephrotoxic agents
- Metabolic acidosis and potassium management
- Monitoring frequency, referral triggers, and preparing the patient for the possibility of progression
A useful way to study this domain is to treat it as a preview of Domain 4. The complications introduced at stage 3 become more severe and more urgent at stages 4 and 5, so learning them well here pays off twice.
Domain 4: Stages 4 & 5 CKD (20-22%)
The second-largest domain covers advanced kidney disease: the period in which complication management intensifies and the patient approaches a decision about kidney replacement. This is where clinical judgment and shared decision-making come together.
Stages 4 & 5 CKD
Questions here often test both the biochemical management of advanced disease and the planning conversation that precedes dialysis or transplant.
- Progressive mineral and bone disorder, hyperparathyroidism, and phosphate binder strategy
- Anemia management at lower GFR and the risks and benefits of treatment targets
- Hyperkalemia, volume overload, and acidosis in advanced disease
- Uremic symptoms and the clinical signals that suggest it is time to start renal replacement
- Modality education and shared decision-making: in-center hemodialysis, home hemodialysis, peritoneal dialysis, transplant, and conservative or supportive care
- Timely access planning, such as referral for vascular access or peritoneal catheter placement
- Transplant referral and evaluation timing
For a sense of how demanding this content is in practice, see How Hard Is the CNN-NP Exam? Complete Difficulty Guide 2026.
Domain 5: Kidney Replacement Therapies (54-56%)
This is the center of gravity of the entire exam. More than half of the scored content comes from Kidney Replacement Therapies, so this domain effectively decides your result. Candidates who come from outpatient CKD clinics, where they rarely manage dialysis directly, should be especially deliberate here.
Because the domain is so large, it spans several clinical areas. Think of it as three overlapping blocks rather than one topic.
Hemodialysis
Hemodialysis Management
Expect detailed, practice-level questions about prescription, adequacy, and complications.
- Dialysis prescription elements: time, blood flow, dialysate composition, ultrafiltration, and dry-weight assessment
- Adequacy measurement and what to do when targets are not met
- Intradialytic complications such as hypotension, cramping, and arrhythmia
- Vascular access: fistula, graft, and catheter, including surveillance, dysfunction, and infection
- Anticoagulation during dialysis and bleeding-risk considerations
- Home hemodialysis considerations and patient selection
Peritoneal Dialysis
Peritoneal Dialysis
Peritoneal dialysis questions reward candidates who understand the physiology behind the prescription.
- Modalities and prescription adjustment, including continuous and automated approaches
- Peritoneal membrane transport characteristics and how they guide therapy
- Peritonitis: recognition, specimen collection, empiric treatment, and when to remove the catheter
- Exit-site and tunnel infections and catheter-related complications
- Adequacy, fluid removal, and residual kidney function
Transplantation and Long-Term Dialysis Care
Transplant and Chronic Dialysis Management
This block links pre-transplant evaluation to post-transplant follow-up and to the ongoing care of dialysis-dependent patients.
- Candidate evaluation, referral, and barriers to waitlisting
- Immunosuppression principles, drug interactions, and monitoring after transplant
- Recognizing rejection, infection, and medication toxicity in the transplant recipient
- Management of anemia, bone and mineral disorder, nutrition, and cardiovascular disease in dialysis patients
- Medication dosing and reconciliation in dialysis-dependent patients
- Symptom management, conservative care, and decisions about withdrawing or not starting dialysis
The breadth here is why this domain feels harder than its peers. If you only have time to deepen one area, make it this one, and use the CNN-NP Study Guide 2026: How to Pass on Your First Attempt to build a structured plan around it.
Cross-Cutting Objectives Across All Domains
The five domains describe what disease states and therapies are covered. A second layer of the blueprint describes how you are expected to think within each of them. These cross-cutting objectives apply to every domain:
- Assessment and diagnosis: interpreting history, examination findings, and laboratory data to reach a working diagnosis.
- Prescribing interventions: selecting and dosing medications and therapies appropriately for reduced kidney function.
- Patient and family education: teaching about disease, treatment options, self-management, and expectations.
- Interdisciplinary care: coordinating with nephrologists, dialysis staff, dietitians, social workers, surgeons, and transplant teams.
- Holistic planning: accounting for psychosocial factors, goals of care, and the whole patient rather than the kidney alone.
Key Takeaway
When you review a topic, ask yourself all five cross-cutting questions about it: How do I assess it? What do I prescribe? What do I teach? Who do I coordinate with? What does the whole-patient plan look like? That habit turns passive review into exam-style reasoning.
Exam Format and Registration Mechanics
Knowing the content is only half the preparation; you also need to understand the logistics so that nothing derails test day.
| Item | Detail |
|---|---|
| Certifying body | Nephrology Nursing Certification Commission (NNCC) |
| Delivery | C-NET administration, PSI computer-based test-center delivery |
| Format | 175 multiple-choice questions, 4 hours |
| Unscored items | Approximately 25 pilot items, per the preparation guide |
| Passing standard | Score of 95, described by NNCC as 70% correct |
| Exam fee | $375 standard; $350 for qualifying ANNA, ASN, NKF, or NOVA members |
| Reduced-fee retake | One within one year: $250 standard / $225 for qualifying members |
| Test conditions | Closed book; matching government-issued photo ID and a 90-day testing permit required |
| Official practice test | 50 questions, 90-day access; $50, or free after certification-exam approval |
The pilot items are worth understanding. Because roughly 25 of the 175 questions do not count toward your score, you cannot tell which ones they are, so treat every question seriously. Note also that the January 2026 application contains an exam-duration figure that conflicts with the 4-hour length on NNCC's live certification page; confirm the current duration when you register.
Eligibility is demanding. You need an unrestricted U.S. or territorial RN license, national NP certification, and a master's degree in nursing. You also need both 2,000 hours and 2 years of nephrology NP practice within the preceding 2 years, plus 20 approved nephrology CE contact hours in the same window. Full details are in CNN-NP Requirements 2026: Eligibility, Prerequisites & How to Qualify, and the money side is broken down in CNN-NP Certification Cost 2026: Complete Pricing Breakdown.
For the scoring detail behind the 95 standard, see CNN-NP Passing Score 2026: Exactly What You Need to Pass.
Sequencing Your Preparation by Domain Weight
Because the blueprint is so unevenly weighted, your study calendar should be too. The sketch below is one way to translate the percentages into an eight-week plan; adjust it to your own strengths and to how much dialysis you manage in daily practice.
Build the Foundation: Domains 1-3
- Cover AKI classification, early CKD screening, and stage 3 complication management
- Keep this block short, since these three domains together are roughly a quarter of the exam
- Take note of anemia and mineral-bone content, which returns in later domains
Advanced CKD: Domain 4
- Work through stage 4 and 5 complications, modality education, and access planning
- Practice the shared decision-making scenarios that bridge into dialysis
Kidney Replacement Therapies: Domain 5
- Dedicate the largest block of time to hemodialysis, peritoneal dialysis, and transplant
- Drill prescription, adequacy, infection, and access-complication scenarios
Integration and Simulation
- Take a timed, mixed-domain practice set that mirrors the 175-question format
- Review weak areas, weighting your remaining hours toward Domains 4 and 5
For timed practice that mirrors this domain distribution, the CNN-NP Exam Prep practice tests let you drill by domain and then switch to mixed sets as your exam date approaches. If you want a compact reference to review alongside your practice, the CNN-NP Cheat Sheet 2026: One-Page Review of Must-Know Facts is a good companion. And when you are ready to choose a test window, check CNN-NP Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Frequently Asked Questions
Kidney Replacement Therapies (Domain 5) is the largest by a wide margin at 54-56% of the blueprint. Stages 4 & 5 CKD (Domain 4) follows at 20-22%. Together they account for roughly three-quarters of the content, so they should receive the bulk of your study time.
According to NNCC's live certification page, the exam has 175 multiple-choice questions and a 4-hour time limit. The preparation guide describes approximately 25 of those items as unscored pilot questions. Because one application document lists a conflicting duration, confirm the current figure when you register.
The passing standard is a score of 95, which NNCC describes as 70% correct. For more on how the scoring works, see CNN-NP Passing Score 2026: Exactly What You Need to Pass.
The ranges reproduce the official April 2018 blueprint revision that NNCC implemented in July 2019 and links in its preparation guide. Older linked outlines conflict with it, so we do not claim a newly verified 2026 blueprint. Always confirm the current outline on the NNCC certification page before finalizing your study plan.
Yes. NNCC offers an official practice test with 50 questions and 90-day access. It costs $50, or it is free after your certification-exam application has been approved. You can supplement it with additional timed sets from the CNN-NP Exam Prep practice test site.