- The Short Answer: What the Letters Spell Out
- Why Each Word in the Title Matters
- Who Grants the Credential
- What the Exam Actually Measures
- Who Qualifies to Sit for It
- Fees, Scheduling, and Test-Day Rules
- Where a CNN-NP Works and Who Hires
- Keeping the Credential Active
- Sequencing Your Preparation by Domain
- Frequently Asked Questions
- CNN-NP means Certified Nephrology Nurse - Nurse Practitioner, a credential from the Nephrology Nursing Certification Commission (NNCC).
- The exam has 175 multiple-choice questions over 4 hours, with a passing standard score of 95 (described as 70% correct).
- Kidney Replacement Therapies makes up roughly 54-56% of the blueprint, dwarfing every other domain.
- Eligibility requires a master's degree in nursing, national NP certification, and 2,000 hours plus 2 years of nephrology NP practice.
The Short Answer: What the Letters Spell Out
CNN-NP stands for Certified Nephrology Nurse - Nurse Practitioner. It is a specialty certification for nurse practitioners who work in kidney care, awarded by the Nephrology Nursing Certification Commission (NNCC). The acronym is easy to confuse with other credentials that happen to share similar letters, so it helps to anchor on the full title: the credential belongs to advanced practice nurses who diagnose, manage, and treat patients with kidney disease.
If you are searching for the quick definition, that is it. The rest of this article explains what each part of the title signals, what the credential demands, and how it fits into a nephrology NP career. For a shorter definitional overview, you can also see our pages on what CNN-NP is and what CNN-NP stands for.
Why Each Word in the Title Matters
The credential's name packs in four distinct signals. Reading them one at a time clarifies what the certification is, and what it is not.
Certified
This is a certification, not a license. Your state board of nursing licenses you as an RN and authorizes your NP scope of practice. The CNN-NP is a separate, voluntary, specialty-level validation of your knowledge in nephrology. It sits on top of your existing licensure and national NP certification rather than replacing either.
Nephrology
The specialty is kidney health: acute kidney injury, the full spectrum of chronic kidney disease (CKD), and the therapies that replace kidney function. The blueprint is heavily weighted toward the advanced end of that spectrum, which is why dialysis and transplant knowledge dominates the exam.
Nurse
The credential is rooted in nursing. Candidates must hold an unrestricted U.S. or territorial RN license, and the cross-cutting objectives reflect nursing's holistic orientation, including patient and family education and interdisciplinary care.
Nurse Practitioner
This is an advanced practice credential. You must already hold national NP certification and a master's degree in nursing, and your experience must come from working as a nephrology NP, not simply as a nephrology nurse. That requirement is what separates the CNN-NP from nephrology certifications aimed at staff nurses and other roles.
Who Grants the Credential
The Nephrology Nursing Certification Commission develops and governs the CNN-NP. The exam is administered through C-NET and delivered by PSI at computer-based test centers. NNCC publishes a preparation guide, an application, a list of exam sites, and recertification information, all of which are the authoritative sources for any decision you make about sitting for the exam. When details conflict between an older outline and current official pages, defer to the live NNCC certification page and confirm your timeline directly before you apply.
For a broader look at the program as a whole, see our overview of CNN-NP certification and the explainer on what CNN-NP certification is.
What the Exam Actually Measures
The exam consists of 175 multiple-choice questions delivered over 4 hours. NNCC's preparation guide describes approximately 25 of those items as unscored pilot questions, which you cannot identify during the test, so treat every question as if it counts. The passing standard score is 95, which NNCC describes as 70% correct. The test is closed book.
The content blueprint divides into five domains. The ranges below reproduce the official April 2018 blueprint revision, which was implemented in July 2019 and appears in the linked preparation guide.
| Domain | Weight |
|---|---|
| Acute Kidney Injury | 6-8% |
| Stages 1 & 2 CKD & General Nephrology | 4-6% |
| Stage 3 CKD | 11-13% |
| Stages 4 & 5 CKD | 20-22% |
| Kidney Replacement Therapies | 54-56% |
Cross-cutting objectives
Beyond the five content domains, questions are written to test five recurring skills: assessment and diagnosis, prescribing interventions, patient and family education, interdisciplinary care, and holistic planning. A question about a patient on dialysis might ask you to interpret findings (assessment), choose a medication or prescription adjustment (intervention), or decide how to coordinate care with a dietitian and social worker (interdisciplinary care). Expect clinical-judgment scenarios rather than pure recall.
Kidney Replacement Therapies (54-56%)
This single domain accounts for more than half the exam, so it deserves the largest share of your preparation. Candidates should be comfortable managing patients across the full range of replacement modalities.
- Hemodialysis and peritoneal dialysis prescription and adequacy
- Vascular access and peritoneal access assessment and complications
- Managing dialysis-related complications and comorbidities
- Kidney transplant evaluation, post-transplant care, and immunosuppression considerations
- Conservative management and decision-making around modality selection
Stages 4 & 5 CKD (20-22%)
The second-largest domain covers advanced CKD, where preparation for kidney replacement therapy begins.
- Managing mineral and bone disorder, anemia, and acid-base and electrolyte disturbances
- Education and planning for modality choice and access placement
- Medication dosing and adjustment at reduced kidney function
Stage 3 CKD (11-13%)
Slowing progression is the central theme.
- Blood pressure and proteinuria management
- Risk stratification and monitoring intervals
- Identifying and addressing contributors to progression, including nephrotoxins
The two smallest domains, Acute Kidney Injury (6-8%) and Stages 1 & 2 CKD & General Nephrology (4-6%), still matter because they contain foundational content you will need throughout. Our deeper walkthrough in the CNN-NP exam domains guide breaks each content area down further.
Who Qualifies to Sit for It
The eligibility bar is deliberately high. The credential is aimed at experienced nephrology nurse practitioners, not recent graduates exploring the specialty. To apply, you need all of the following:
- An unrestricted U.S. or territorial RN license
- National NP certification
- A master's degree in nursing
- Both 2,000 hours and 2 years of nephrology NP practice within the preceding 2 years
- 20 approved nephrology CE contact hours within the preceding 2 years
Notice that the practice requirement is recency-based: the hours and the time span must both fall within the preceding two years. The 20 CE contact hours must also be approved nephrology content. If you are still early in your nephrology NP career, work through the full CNN-NP requirements breakdown to map where you stand before paying any application fee.
Key Takeaway
Count your hours before you count your study days. Many candidates underestimate how specific the practice requirement is: both the 2,000 hours and the two-year span must be nephrology NP practice within the preceding two years. Document your hours with your employer early so application day is not a scramble.
Fees, Scheduling, and Test-Day Rules
| Item | Standard | Qualifying Member |
|---|---|---|
| Exam fee | $375 | $350 (ANNA, ASN, NKF, or NOVA) |
| Reduced-fee retake (within one year) | $250 | $225 |
| Official practice test (50 questions, 90-day access) | $50 | Free after exam approval |
| Recertification fee | $300 | $275 |
All figures are in USD. The membership discount applies to qualifying members of ANNA, ASN, NKF, or NOVA, so check whether your existing membership qualifies before you pay the standard rate. The official practice test is free once your application for the certification exam is approved. Read our CNN-NP certification cost breakdown to build a complete budget, including study materials and CE.
Test-day mechanics
- You receive a 90-day testing permit after approval, which defines your window to schedule and sit for the exam.
- You must present government-issued photo identification that matches the name on your registration.
- The exam is closed book and taken at a PSI computer-based test center.
- A January 2026 application contains a conflicting exam duration, so confirm the current 4-hour format on NNCC's live certification page when you register.
Because scheduling windows and deadlines can shift, check our guide to CNN-NP exam dates alongside NNCC's exam-sites page when planning your test day.
Where a CNN-NP Works and Who Hires
Nephrology NPs practice wherever kidney disease is diagnosed and managed. Because the exam is so heavily weighted toward kidney replacement therapies, it reflects a workforce that spends much of its time with dialysis and transplant populations. Common employers and settings include:
- Outpatient dialysis organizations that employ NPs to round on in-center hemodialysis patients and support home dialysis programs
- Nephrology physician group practices that rely on NPs for CKD clinics and hospital consults
- Hospital systems and academic medical centers with inpatient nephrology services, acute dialysis, and transplant programs
- Transplant centers that need NPs for pre-transplant evaluation and long-term post-transplant follow-up
- Integrated kidney care and value-based care programs focused on slowing CKD progression and coordinating care
Employers and hiring managers in these settings often view the credential as evidence of specialty commitment. Whether it changes your compensation or opportunities depends on your market, so rather than relying on generalizations, compare current openings using our CNN-NP jobs overview, and see the salary guide and ROI analysis for how to evaluate the investment for your situation.
Keeping the Credential Active
CNN-NP certification lasts 5 years. When the cycle ends, you recertify, and NNCC offers two paths: continuing education or re-examination.
Recertification by continuing education
To renew by CE, you must maintain your RN and NP credentials and complete both of the following within the 5-year period:
- 1,000 hours of nephrology NP practice
- 75 approved CE hours
The renewal fee is $300 standard or $275 for partner members.
Sequencing Your Preparation by Domain
The blueprint tells you exactly where to spend your time. Because Kidney Replacement Therapies is more than half the exam, a sensible plan front-loads the foundations, then devotes the largest block to dialysis and transplant. A condensed example:
Foundations and smaller domains
- Review Acute Kidney Injury and Stages 1 & 2 CKD, which establish pathophysiology and diagnostics
- Take the official 50-question practice test early to find baseline gaps
CKD progression
- Cover Stage 3 CKD, then Stages 4 & 5 CKD, focusing on complication management and modality planning
Kidney Replacement Therapies
- Spend the longest stretch on dialysis prescription, access, complications, and transplant care
- Practice scenario questions that combine assessment, prescribing, and interdisciplinary care
Adjust the length to your own experience; a seasoned dialysis NP may compress the last block while someone from an outpatient CKD clinic may need more time there. For a fuller plan, see our CNN-NP study guide, the one-page cheat sheet for final review, and the difficulty guide to calibrate expectations. When you are ready to test yourself, work through realistic questions on our CNN-NP practice test site.
Frequently Asked Questions
CNN-NP stands for Certified Nephrology Nurse - Nurse Practitioner. It is a specialty certification granted by the Nephrology Nursing Certification Commission (NNCC) to qualified nurse practitioners in kidney care.
No. It is a voluntary specialty certification. Your state board licenses you as an RN and defines your NP scope of practice; the CNN-NP validates specialty knowledge in nephrology on top of those requirements.
The exam has 175 multiple-choice questions over 4 hours, including approximately 25 unscored pilot items. The passing standard score is 95, which NNCC describes as 70% correct. See our passing score guide for details.
Kidney Replacement Therapies, at roughly 54-56% of the blueprint. Stages 4 & 5 CKD is next at 20-22%, followed by Stage 3 CKD at 11-13%.
Five years. You can renew by CE, which requires maintained RN and NP credentials, 1,000 nephrology NP practice hours, and 75 approved CE hours, or by re-examination as an alternative to the CE route.