- A CPHON is a nurse certified by ONCC to specialize in pediatric hematology and oncology care.
- The exam has 165 questions (125 scored) across six domains, with Symptom Management and Supportive Care weighted heaviest at 26%.
- Eligibility requires 2,000 hours of pediatric hem/onc practice in the prior 4 years plus an active RN license.
- Passing requires a scaled score of 55 on a 25-75 scale, administered via PSI test centers.
What Is A CPHON, Exactly?
CPHON stands for Certified Pediatric Hematology Oncology Nurse. It's a specialty credential administered by the Oncology Nursing Certification Corporation (ONCC) that identifies registered nurses who have demonstrated advanced knowledge in caring for children with cancer and blood disorders. Unlike a general oncology certification, CPHON is built specifically around pediatric physiology, developmental stages, family-centered care models, and the unique treatment protocols used in children's hospitals and pediatric oncology units.
If you're asking "what is a CPHON," you're likely a nurse working in a pediatric hem/onc unit wondering whether the credential is attainable and worthwhile. The short answer: it's a rigorous, practice-based certification that validates your clinical judgment across six defined domains, not a generic knowledge test. For a broader look at the credential's origins and structure, see our companion piece on CPHON Certification, and if you want the terminology broken down further, check CPHON Meaning or What Does CPHON Stand For?
Who Hires CPHONs?
The credential is most valued in settings where children receive complex hematologic or oncologic treatment: pediatric hospitals with dedicated hem/onc units, children's cancer centers, bone marrow/stem cell transplant programs, and outpatient infusion clinics that treat pediatric patients. Nurse educators, clinical coordinators, and charge nurses in these units frequently hold CPHON as a marker of specialized competence, and some institutions use it as a differentiator for career-ladder promotions.
Because the role requires hands-on exposure to chemotherapy administration, blood product support, and pediatric-specific emergencies, CPHON-credentialed nurses are often the go-to resource for less experienced staff. If you're evaluating whether pursuing the credential makes sense for your career trajectory, our analysis in Is the CPHON Certification Worth It? Complete ROI Analysis 2026 and CPHON Salary Guide 2026: Complete Earnings Analysis covers the practical tradeoffs in more depth. You can also browse current openings that specify the credential in CPHON Jobs.
Eligibility: Who Can Become A CPHON
ONCC sets clear, non-negotiable eligibility criteria before you can even sit for the exam:
- An active, unencumbered RN license valid in the U.S., a U.S. territory, or Canada
- At least 2 years of RN experience within the preceding 4 years
- 2,000 hours of pediatric hematology/oncology nursing practice within the preceding 4 years
- 10 contact hours of oncology or hematology nursing continuing education (or an academic elective) within the preceding 3 years, with no more than 5 of those hours coming from CME or CPE
These thresholds exist because CPHON is a practice-validated credential, not a knowledge-only exam. ONCC wants to confirm that candidates have actually spent significant time at the bedside with pediatric hem/onc patients before testing their judgment on scenario-based questions. For a full walkthrough of documentation requirements and how to verify your hours, see CPHON Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Start logging your pediatric hem/onc practice hours early - the 2,000-hour requirement covers only the preceding 4 years, so gaps in specialty assignment can delay eligibility.
Exam Format And Registration Mechanics
The CPHON exam is delivered at PSI test centers and consists of 165 four-option, one-best-answer multiple-choice questions. Of these, 125 are scored and 40 are unscored pretest items used to evaluate future exam content - you won't know which is which during the test. The total session runs 3 hours, which includes a 15-minute tutorial and a post-test survey, and there are no scheduled breaks built into that window.
Registration fees depend on membership status: $300 for Oncology Nursing Society (ONS) or Association of Pediatric Hematology/Oncology Nurses (APHON) members, and $420 for nonmembers. Once approved, candidates receive a 90-day testing window through PSI to schedule and sit for the exam. One detail that trips up newer candidates: the exam uses generic drug names throughout, so if your clinical unit primarily uses brand names in daily documentation, you'll need to cross-reference generics during study.
For the full pricing breakdown, including what's included and how membership discounts work, read CPHON Certification Cost 2026: Complete Pricing Breakdown. If you're mapping out when to register relative to your practice hours and CE deadlines, CPHON Exam Dates 2026: Testing Windows, Deadlines & Scheduling walks through the scheduling logistics.
| Exam Detail | Specification |
|---|---|
| Total Questions | 165 (125 scored, 40 unscored pretest) |
| Session Length | 3 hours, including 15-minute tutorial and survey |
| Question Format | Four-option, one-best-answer multiple choice |
| Passing Score | Scaled score of 55 (25-75 scale) |
| Testing Window | 90 days via PSI |
| Member Fee | $300 (ONS or APHON members) |
| Nonmember Fee | $420 |
The Six Domains A CPHON Must Master
The 2026 exam blueprint, based on the 2021 role delineation study, organizes content into six domains. Understanding how heavily each is weighted tells you exactly where to invest study time.
Domain 1: Care Continuum (6%)
Covers how pediatric hem/onc patients move through diagnosis, treatment, survivorship, and end-of-life phases, including coordination across care settings.
- Transitions between inpatient, outpatient, and home care
Domain 2: Pediatric Hematology and Oncology Nursing Practice (18%)
Focuses on foundational disease knowledge - leukemias, lymphomas, solid tumors, and hematologic disorders - plus developmental considerations unique to pediatric patients.
- Disease pathophysiology across age groups
- Developmentally appropriate assessment techniques
Domain 3: Treatment Modalities and Side Effects (21%)
Tests knowledge of chemotherapy, radiation, immunotherapy, and transplant protocols, along with expected and adverse effects specific to pediatric dosing and physiology.
- Chemotherapy administration safety
- Recognizing treatment-related toxicities early
Domain 4: Symptom Management and Supportive Care (26%)
The largest domain on the exam. Covers pain management, nausea/vomiting control, nutrition support, and infection prevention in immunocompromised pediatric patients.
- Pain assessment across developmental stages
- Managing myelosuppression and neutropenic precautions
Domain 5: Pediatric Hematologic and Oncologic Emergencies (21%)
Tests recognition and management of tumor lysis syndrome, sepsis, superior vena cava syndrome, and other acute events requiring rapid intervention.
- Early recognition of oncologic emergencies
- Time-sensitive intervention sequencing
Domain 6: Psychosocial Dimensions of Care (8%)
Addresses family communication, coping strategies, developmental impact of illness, and end-of-life psychosocial support.
- Family-centered communication strategies
- Supporting siblings and caregivers through treatment
Together, Domains 3, 4, and 5 make up roughly two-thirds of the exam, so mastering treatment modalities, supportive care, and emergency recognition should anchor your preparation. For a deeper breakdown of each domain's subtopics and sample question styles, see CPHON Exam Domains 2026: Complete Guide to All 6 Content Areas.
Scoring And Pass Rates
CPHON uses a scaled scoring system ranging from 25 to 75, with a passing threshold of 55. This isn't a raw percentage - ONCC applies a scaling formula that accounts for question difficulty, so two candidates who answer a different mix of items correctly could receive comparable scaled scores. In 2025, the initial-candidate pass rate was 69%, while the overall pass rate (including repeat test-takers) was 68%.
These numbers suggest the exam is challenging but achievable for candidates who meet the practice-hour requirements and study deliberately, particularly around the heavily weighted domains. For more context on how the scaled score works and what it means for your preparation strategy, read CPHON Passing Score 2026: Exactly What You Need to Pass and CPHON Pass Rate 2026: What the Data Shows. If you're trying to gauge overall difficulty relative to other nursing certifications, How Hard Is the CPHON Exam? Complete Difficulty Guide 2026 offers a detailed comparison.
Maintaining CPHON Certification
Once earned, CPHON certification is valid for 4 years. Renewal requires maintaining active RN status plus completing two of three qualifying components:
- Qualifying practice - 1,000 pediatric hematology/oncology nursing hours within the prior 30 months
- Professional development or learning-plan points - ongoing education tied to pediatric hem/onc practice
- Retesting - sitting for the exam again instead of documenting practice or CE hours
This structure gives working nurses flexibility: if you've moved into a role with fewer direct pediatric hem/onc hours, you can still renew through professional development points rather than being forced to retest.
When To Schedule Your Domain Review
Rather than treating all six domains equally, sequence your review around their exam weight and your existing clinical exposure. Nurses already comfortable with day-to-day symptom management often need more dedicated time on emergencies and treatment modalities, since those topics require recognizing rare but high-stakes presentations rather than routine care patterns.
Foundational Domains
- Review Domain 2 (Pediatric Hematology and Oncology Nursing Practice) and Domain 1 (Care Continuum)
- Build disease-process flashcards by tumor and blood disorder type
Highest-Weight Domains
- Focus on Domain 4 (Symptom Management and Supportive Care) - the largest domain at 26%
- Drill Domain 3 (Treatment Modalities and Side Effects) using generic drug names
High-Stakes Scenarios
- Work through Domain 5 (Pediatric Hematologic and Oncologic Emergencies) case scenarios
- Review Domain 6 (Psychosocial Dimensions of Care) communication frameworks
Full Practice Exams
- Simulate full-length 165-question sessions under timed conditions
- Review missed items by domain to identify remaining gaps
For a structured, week-by-week plan with more detail on resource selection and review cadence, see our CPHON Study Guide 2026: How to Pass on Your First Attempt. And once you're closer to test day, the CPHON Cheat Sheet 2026: One-Page Review of Must-Know Facts is a useful condensed reference for last-minute review.
Throughout your preparation, working through realistic practice questions on our CPHON practice test platform will help you get comfortable with the four-option, one-best-answer format and the pacing required to complete 165 questions within the 3-hour session. Repeated exposure to domain-tagged questions on the practice site also makes it easier to spot which of the six domains needs more attention before you commit to a testing date.
Frequently Asked Questions
A CPHON is a registered nurse certified by ONCC who has demonstrated specialized knowledge and hands-on experience in caring for pediatric patients with cancer and blood disorders, verified through a practice-hour requirement and a 165-question exam.
The exam contains 165 four-option, one-best-answer multiple-choice questions total: 125 are scored and 40 are unscored pretest items, delivered in a 3-hour session that includes a tutorial and survey.
The fee is $300 for ONS or APHON members and $420 for nonmembers, paid through ONCC before scheduling your exam at a PSI test center.
You need a scaled score of 55 on a 25-75 scale. This is not a simple percentage-correct calculation but a scaled score accounting for question difficulty.
CPHON certification is valid for 4 years. Renewal requires an active RN license plus completing two of three components: qualifying practice hours, professional-development points, or retesting.