OCN exam guide
About the Oncology Certified Nurse (OCN) exam
OCN assesses the knowledge used in adult oncology nursing across prevention, diagnosis, treatment, symptom management, emergencies, psychosocial care, survivorship, palliative care, and professional practice. Strong preparation links cancer biology and treatment mechanisms with nursing assessment, safe administration, monitoring, education, coordination, and timely escalation.
MedPorium is an independent education platform and is not affiliated with or endorsed by Oncology Nursing Certification Corporation (ONCC). Exam details can change; confirm them with the official source before applying.
OCN exam format at a glance
- Questions
- 165
- 125 scored; 40 unscored
- Time
- 3 hours, including the tutorial and post-test survey
- Delivery
- Computer-based testing through PSI
Knowledge to review for the OCN exam
These foundations support the practical tasks in the official examination matrix.
Cancer continuum and practice
- Prevention, screening, epidemiology, navigation, survivorship, rehabilitation, palliation, and end-of-life care
- Carcinogenesis, immunology, diagnostics, genetics, genomics, staging, grading, metastasis, and performance status
- Standards, documentation, ethics, advocacy, culture, collaboration, safe handling, occupational safety, and clinician self-care
Treatment and supportive care
- Surgery, procedures, radiation, systemic therapy, targeted therapy, immune and cellular therapy, transplant, localized and oral therapy
- Vascular access, hematologic, gastrointestinal, genitourinary, integumentary, respiratory, cardiovascular, neurologic, and musculoskeletal effects
- Pain, nutrition, rehabilitation, pharmacologic support, complementary care, acute effects, late effects, and response monitoring
Emergencies and whole-person care
- Sepsis, DIC, tumor lysis, SIADH, hypercalcemia, tamponade, cord compression, SVC syndrome, VTE, obstruction, and increased ICP
- Hypersensitivity, anaphylaxis, extravasation, pneumonitis, cytokine release syndrome, ICANS, and immune-related adverse events
- Distress, coping, grief, spirituality, body image, sexuality, fertility, caregiver fatigue, crisis, learning barriers, and financial concerns
OCN examination matrix
The percentages below are the approximate exam-score weights published by Oncology Nursing Certification Corporation (ONCC). Use them to allocate study time, then adjust for your own weak areas.
14%
Care Continuum
Support prevention, screening, navigation, survivorship, palliation, advance planning, and end-of-life care across the cancer trajectory.
- Apply epidemiology, risk reduction, screening, and early-detection principles
- Coordinate navigation, rehabilitation, surveillance, recurrence concerns, and delayed effects
- Support goals of care, advance directives, hospice, bereavement, caregivers, and comfort
15%
Oncology Nursing Practice
Apply cancer science, diagnostic and prognostic information, professional standards, safety, ethics, advocacy, and culturally congruent care.
- Relate carcinogenesis, immunology, genetics, genomics, diagnostics, staging, grading, metastasis, and performance status
- Apply research, clinical-trial, documentation, accreditation, scope, and standards principles
- Use safe handling, PPE, ethical reasoning, advocacy, collaboration, culture, and professional self-care
20%
Treatment Modalities
Provide safe nursing care and education across surgical, radiation, systemic, localized, targeted, cellular, transplant, and oral therapies.
- Prepare, educate, assess, and monitor patients receiving procedures, surgery, radiation, and transplant
- Apply nursing principles for chemotherapy, endocrine, immunotherapy, targeted, bispecific, cellular, intrathecal, intravesical, and oral therapy
- Recognize expected response, common toxicities, administration risks, and findings requiring escalation
25%
Symptom Management and Supportive Care
The largest domain covers treatment effects, system alterations, vascular access, pain, nutrition, rehabilitation, and supportive interventions.
- Assess acute, chronic, and delayed symptoms across body systems
- Manage vascular access, hematologic and immune effects, pain, nutrition, function, and treatment-related alterations within nursing scope
- Use pharmacologic, nonpharmacologic, complementary, palliative, educational, and interdisciplinary support
16%
Oncologic Emergencies
Recognize high-risk oncologic and treatment emergencies, initiate immediate nursing actions, and escalate promptly.
- Recognize sepsis, DIC, tumor lysis, SIADH, hypercalcemia, tamponade, obstruction, VTE, cord compression, SVC syndrome, and increased ICP
- Respond to anaphylaxis, hypersensitivity, extravasation, pneumonitis, immune toxicities, CRS, and ICANS
- Prioritize stabilization, treatment interruption when indicated, focused assessment, monitoring, communication, and emergency activation
10%
Psychosocial Dimensions of Care
Address culture, spirituality, distress, coping, family dynamics, sexuality, fertility, crisis, learning, autonomy, caregiving, and financial burden.
- Assess distress, depression, grief, crisis, suicide risk, violence, caregiver fatigue, and support needs
- Provide culturally responsive education and adapt for literacy, language, preference, and access barriers
- Support body image, intimacy, fertility, sexuality, gender diversity, autonomy, resources, and family coping
How to use this OCN diagnostic
The 15 questions sample all six official domains, with the largest share devoted to Symptom Management and Supportive Care. Classify each gap as continuum, biology and diagnosis, treatment, symptom or supportive care, emergency recognition, psychosocial care, safety, education, or professional practice instead of relying on the overall percentage alone.
High-yield OCN study priorities
Priority 1
Give symptom care the largest share
Use system-based cases that require cause, assessment, prevention, intervention, teaching, reassessment, and escalation rather than memorizing toxicity lists.
Priority 2
Pair every therapy with nursing surveillance
For each modality, know preparation, administration safety, expected effects, early toxicity, delayed toxicity, patient education, and the finding that changes the plan.
Priority 3
Rehearse emergencies as first-action cases
Practise recognizing the pattern, protecting airway and circulation, stopping a causative infusion when appropriate, obtaining focused data, escalating, and monitoring response.
Priority 4
Follow patients beyond active treatment
Include recurrence surveillance, late effects, rehabilitation, sexuality, psychosocial recovery, caregiver needs, palliation, and goals of care in mixed practice.
OCN exam FAQ
How many questions are on the OCN exam?
ONCC currently lists 165 multiple-choice questions. Of these, 125 count toward the score and 40 are unscored pretest questions that cannot be identified during the examination.
How long is the OCN exam?
The test session is three hours, including 15 minutes for the computer-based testing tutorial before the exam and a post-test survey. There are no scheduled breaks, and the timer continues during an unscheduled break.
How is the OCN content outline weighted?
The 2026 outline is weighted Care Continuum 14%, Oncology Nursing Practice 15%, Treatment Modalities 20%, Symptom Management and Supportive Care 25%, Oncologic Emergencies 16%, Psychosocial Dimensions of Care 10%. The percentages apply to the 125 scored questions.
How long is the OCN testing window?
ONCC currently provides a 90-day testing window after authorization to test. Candidates should confirm processing times, authorization dates, and scheduling instructions directly with ONCC.
Who should verify eligibility for OCN?
Candidates should confirm the current license, education, experience, practice-hour, and continuing-education requirements on the official ONCC page before applying. This study page does not determine eligibility.
Does this diagnostic predict whether I will pass?
No. A 15-question diagnostic is a low-confidence baseline, not a validated pass prediction. Review every rationale, then use larger mixed and domain-specific sets to build a more stable readiness estimate.
Is MedPorium affiliated with ONCC?
No. MedPorium is an independent education platform and is not affiliated with or endorsed by the Oncology Nursing Certification Corporation.
Review and official source
Clinical reviewer: D. A. Harper
Exam format and matrix information were checked against the ONCC Oncology Certified Nurse certification page. Source reviewed October 12, 2026.
Ready to check your OCN knowledge?
Take the free 15-question practice test to identify strengths and topics that need more review.