- Exam Blueprint Overview
- Domain 1: Care Continuum
- Domain 2: Pediatric Hematology and Oncology Nursing Practice
- Domain 3: Treatment Modalities and Side Effects
- Domain 4: Symptom Management and Supportive Care
- Domain 5: Pediatric Hematologic and Oncologic Emergencies
- Domain 6: Psychosocial Dimensions of Care
- Question Style and Format
- Mapping Domains to a Study Timeline
- FAQ
- Symptom Management and Supportive Care is the largest domain at 26% of the CPHON exam.
- Treatment Modalities and Side Effects (21%) and Emergencies (21%) together make up 42% of scored items.
- The exam has 165 total questions, 125 scored, delivered in a 3-hour PSI session.
- Care Continuum is the smallest domain at just 6%, but it still requires focused review.
Exam Blueprint Overview
The CPHON exam is built entirely around a six-domain content outline that the Oncology Nursing Certification Corporation (ONCC) updated based on its 2021 role delineation study. Every one of the 125 scored questions on your exam maps to one of these six domains, and the 40 unscored pretest items are mixed in without any way to tell them apart. If you're building a study plan, the domain weightings are the single most important piece of information you have-they tell you exactly where to spend your limited prep time.
This guide breaks down all six content areas, what ONCC expects you to know inside each one, and how the weightings should shape your review schedule. For a broader look at how to structure your entire prep timeline, see the CPHON Study Guide 2026: How to Pass on Your First Attempt, and if you're still deciding whether the credential fits your career, check Is the CPHON Certification Worth It? Complete ROI Analysis 2026.
| Domain | Weight | Approx. Scored Items* |
|---|---|---|
| 1. Care Continuum | 6% | ~8 |
| 2. Pediatric Hematology and Oncology Nursing Practice | 18% | ~23 |
| 3. Treatment Modalities and Side Effects | 21% | ~26 |
| 4. Symptom Management and Supportive Care | 26% | ~33 |
| 5. Pediatric Hematologic and Oncologic Emergencies | 21% | ~26 |
| 6. Psychosocial Dimensions of Care | 8% | ~10 |
*Approximate figures calculated from 125 scored items; ONCC does not publish an exact per-domain item count.
Domain 1: Care Continuum (6%)
Care Continuum is the smallest domain on the CPHON exam, but it sets the stage for everything else. It covers how children and adolescents move through diagnosis, treatment, survivorship, and end-of-life care within the pediatric hematology/oncology system.
Care Continuum
Candidates should understand the full arc of the patient and family journey, not just clinical treatment phases.
- Diagnostic workup sequencing and communication of results to families
- Transitions between inpatient, outpatient, and home care settings
- Survivorship care planning and late effects surveillance
- Palliative and end-of-life care coordination within the oncology team
Because this domain carries only 6% weight, most candidates need a light but deliberate review-enough to answer confidently without over-investing hours that would be better spent elsewhere.
Domain 2: Pediatric Hematology and Oncology Nursing Practice (18%)
This domain covers the foundational clinical knowledge that underlies everything a pediatric hem/onc nurse does day to day: disease processes, diagnostic tests, and core nursing responsibilities specific to this population.
Pediatric Hematology and Oncology Nursing Practice
Expect questions on disease biology, lab interpretation, and the nurse's role in coordinating care.
- Pathophysiology of leukemias, lymphomas, solid tumors, and CNS tumors in children
- Hematologic disorders such as sickle cell disease, hemophilia, and thrombocytopenia
- Interpretation of CBCs, coagulation panels, and tumor marker trends
- Vascular access device management, including central lines and implanted ports
This is one of the denser knowledge domains, so many candidates pair it with review of drug names-remember that the exam uses generic drug names throughout, so memorizing brand names alone will leave gaps.
Domain 3: Treatment Modalities and Side Effects (21%)
Tied for the second-largest domain, Treatment Modalities and Side Effects tests your knowledge of every major therapy used in pediatric oncology and hematology, plus the expected and unexpected effects each one produces.
Treatment Modalities and Side Effects
This domain spans chemotherapy, radiation, surgery, immunotherapy, and cellular therapies.
- Chemotherapy classifications, administration principles, and extravasation management
- Radiation therapy planning and site-specific acute/late effects
- Hematopoietic stem cell transplant phases, conditioning regimens, and graft-versus-host disease
- CAR T-cell therapy and immunotherapy-specific toxicities such as cytokine release syndrome
Key Takeaway
Because Domain 3 and Domain 5 overlap heavily around toxicity management, study them back-to-back rather than in isolation-many treatment side effects escalate into the emergencies covered in Domain 5.
Domain 4: Symptom Management and Supportive Care (26%)
Symptom Management and Supportive Care is the single largest domain on the CPHON blueprint, representing about one out of every four scored questions. If you only have time to deeply master one domain, this is it.
Symptom Management and Supportive Care
This domain covers the day-to-day supportive interventions that define pediatric oncology nursing practice.
- Pain assessment and management across developmental stages, including opioid and non-opioid strategies
- Nausea, vomiting, and mucositis prevention and treatment protocols
- Nutritional support, including enteral/parenteral nutrition decision-making
- Infection prevention in neutropenic patients and antimicrobial stewardship basics
- Skin integrity, fatigue management, and sleep disruption interventions
Given its weight, this domain deserves the largest share of your review calendar. If you're building a week-by-week plan, the CPHON Study Guide 2026: How to Pass on Your First Attempt walks through how to allocate multiple weeks specifically to supportive care content.
Domain 5: Pediatric Hematologic and Oncologic Emergencies (21%)
Tied with Treatment Modalities at 21%, this domain tests your ability to recognize and respond to time-sensitive, high-acuity events specific to pediatric hematology and oncology patients.
Pediatric Hematologic and Oncologic Emergencies
Expect scenario-based questions requiring rapid clinical prioritization.
- Tumor lysis syndrome recognition and electrolyte management
- Superior vena cava syndrome and spinal cord compression
- Sepsis and septic shock in the immunocompromised pediatric patient
- Disseminated intravascular coagulation and severe hemorrhage
- Increased intracranial pressure from CNS tumors or treatment complications
This domain rewards nurses who can think in "first, next, last" sequences under pressure-exactly the skill the exam's scenario-style questions are designed to test.
Domain 6: Psychosocial Dimensions of Care (8%)
The final domain focuses on the emotional, developmental, and family-systems side of pediatric hematology/oncology nursing. It's a smaller slice of the exam but touches nearly every clinical encounter in practice.
Psychosocial Dimensions of Care
This domain addresses communication, coping, and family-centered care across the illness trajectory.
- Developmentally appropriate communication with infants through adolescents
- Family coping mechanisms, sibling support, and caregiver burnout signs
- Grief, bereavement, and anticipatory loss support
- Cultural and spiritual considerations in pediatric oncology care
Question Style and Format
All 165 questions on the CPHON exam-125 scored plus 40 unscored pretest items-use a four-option, one-best-answer multiple-choice format. There's no way to identify which questions are pretest items during the exam, so every question deserves full attention. You'll have a 3-hour session that includes a 15-minute tutorial and a post-test survey, and there are no scheduled breaks built into that window.
Most questions are scenario-based rather than pure recall. Instead of asking you to define a term, ONCC tends to present a short clinical vignette-a patient's age, diagnosis, current treatment phase, and a set of symptoms or lab values-then ask what the nurse should do first, next, or most appropriately. This style rewards candidates who can apply domain knowledge to a specific pediatric context rather than just memorize facts in isolation.
For more on how the score is calculated and what a scaled 55 actually represents, read CPHON Passing Score 2026: Exactly What You Need to Pass. And if you want to know how the domain weightings translate into real-world difficulty, How Hard Is the CPHON Exam? Complete Difficulty Guide 2026 breaks that down in more detail.
Mapping Domains to a Study Timeline
Once you understand the six domains, the next step is turning that blueprint into a realistic study calendar. Rather than studying topics in the order they appear in a textbook, allocate time in proportion to exam weight-spend the most hours on Symptom Management and Supportive Care (26%), followed closely by Treatment Modalities and Side Effects and Emergencies (21% each), then Nursing Practice (18%), and finally the two smaller domains, Psychosocial Dimensions (8%) and Care Continuum (6%).
Foundation: Domains 2 and 1
- Review disease pathophysiology, lab values, and vascular access basics
- Layer in Care Continuum topics since they connect to diagnosis and transitions
Heavy Lift: Domain 4
- Deep dive into pain management, mucositis, nutrition, and neutropenic precautions
- Practice scenario questions that combine multiple supportive care interventions
Treatment and Emergencies: Domains 3 and 5
- Study chemotherapy classes and transplant phases alongside their emergent complications
- Drill tumor lysis syndrome, SVC syndrome, and sepsis recognition scenarios
Closing Gaps: Domain 6 and Review
- Cover psychosocial and family-systems content
- Run full-length practice sets weighted to match the real domain percentages
This kind of weighted scheduling avoids the common mistake of spending equal time on all six domains, which under-prepares you for the two-thirds of the exam concentrated in Domains 3, 4, and 5. You can find a more detailed week-by-week breakdown, including daily task suggestions, in the CPHON Study Guide 2026: How to Pass on Your First Attempt.
To build genuine familiarity with the scenario-based question style described above, working through full-length timed sets on CPHON Exam Prep's practice test platform lets you rehearse domain-weighted question mixes before test day. Reviewing missed questions by domain-rather than just tallying a score-helps you see exactly which of the six content areas still needs work.
Frequently Asked Questions
Most candidates start with Domain 2, Pediatric Hematology and Oncology Nursing Practice, since it establishes the disease and lab knowledge that Domains 3, 4, and 5 build on.
Symptom Management and Supportive Care is weighted at 26% of the exam, which translates to roughly a quarter of the 125 scored questions.
No. Of the 165 total questions, only 125 are scored; the other 40 are unscored pretest items, and there is no way to distinguish them during the exam.
Yes. ONCC builds every CPHON exam form from the same six-domain blueprint and weighting percentages, based on the 2021 role delineation study.
For the most recent published pass rate figures and what they suggest about exam difficulty, see CPHON Pass Rate 2026: What the Data Shows.