- The Basics: Who Runs the CRN Exam and What It Actually Is
- Fees, Eligibility, and Application Mechanics
- Exam Format at a Glance
- The Five Domains, Weighted
- The Modality Blueprint: Interventional Radiology Dominates
- Recertification: The 4-Year Clock
- Testing Windows and Scheduling Facts
- One-Week Priority Map
- Quick Reference Table
- FAQs
- RNCB, not ARIN, administers the CRN; C-NET delivers the 150-question, 3-hour exam.
- Interventional Radiology is the single highest-weighted modality at 35% - study it first.
- Eligibility requires 2,000 practice hours in 3 years plus 30 CE hours (15 radiology-specific).
- Certification lasts 4 years; recertify via exam or 60 contact hours plus practice hours.
The Basics: Who Runs the CRN Exam and What It Actually Is
The Certified Radiology Nurse (CRN) credential is not owned or administered by the Association for Radiologic and Imaging Nursing (ARIN). It is issued by the Radiologic Nursing Certification Board (RNCB), a separate certifying body. ARIN membership only matters for one thing on this sheet: a discounted exam fee. The actual test - officially the Certification Examination for Radiologic Nursing in Imaging, Interventional, and Therapeutic Environments - is developed and delivered on RNCB's behalf by C-NET (the Center for Nursing Education and Testing) at regional, computer-based testing centers.
If you're still mapping out what this credential even covers before diving into logistics, start with What Is CRN Certification? or the broader overview at CRN Certification. This cheat sheet assumes you already know the "what" and need the exact numbers.
Fees, Eligibility, and Application Mechanics
Fee structure is straightforward but strict on deadlines:
- ARIN member rate: $325
- Non-member rate: $425
- Late fee: $45, non-refundable, accepted up to 14 days past the application deadline
Eligibility is where candidates most often stumble. RNCB requires:
- A current, active RN license (or recognized international equivalent)
- A minimum of 2,000 hours of radiology nursing practice within the past 3 years
- 30 contact hours of continuing education applicable to radiology nursing, completed within 24 months of the exam date
- Of those 30 hours, at least 15 must be radiology-nursing-specific
- Verification from two responsible practitioners in the specialty, at least one of whom holds a supervisory position, confirming your practice hours
For a full walkthrough of how these pieces fit together - including edge cases like part-time practice or transitioning from another specialty - see CRN Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Line up your two practitioner verifications early. Finding a supervisor willing to sign off during a busy testing window is often the actual bottleneck, not the hours themselves.
Exam Format at a Glance
The CRN exam is a closed-book, computer-based test:
- Maximum of 150 multiple-choice objective questions
- Total testing time: 3 hours
- No reference materials, calculators, or electronic devices permitted
- Delivered at C-NET regional testing centers
There's no essay component, no simulation lab, and no oral defense - it's pure multiple-choice recall and clinical judgment under time pressure. That format rewards candidates who can quickly eliminate distractors on scenario-based questions rather than those who simply memorize isolated facts. For a deeper dive into exactly how many questions you need right to pass, check CRN Passing Score 2026: Exactly What You Need to Pass.
The Five Domains, Weighted
RNCB's blueprint splits content into five practice-area domains. Memorize these weights - they tell you exactly where your study hours should go.
Domain 1: Assess Patient and Plan Care (25%)
Pre-procedure assessment, history-taking, risk stratification, and care planning specific to imaging and interventional settings.
- Contrast allergy and renal function screening
- Sedation risk assessment prior to procedures
Domain 2: Administer, Monitor, and Evaluate Therapeutic Interventions (25%)
Moderate sedation/analgesia administration, medication monitoring, and evaluating patient response during and after procedures.
- Conscious sedation protocols and reversal agents
- Post-procedure monitoring parameters
Domain 3: Teach Patient and Family / Provide a Supportive Environment (17%)
Patient education before, during, and after imaging or interventional procedures, plus family communication and psychosocial support.
- Pre-procedure instructions and informed consent literacy
- Discharge teaching for interventional cases
Domain 4: Provide a Safe Environment / Manage Emergency Situations (25%)
Radiation safety, contrast reaction management, emergency response, and infection control in imaging environments.
- Contrast extravasation and anaphylaxis response
- Radiation dose reduction principles
Domain 5: Participate in QA/CQI, Interdisciplinary Activities, and Professional Practice Activities (8%)
Quality assurance, continuous quality improvement, interdisciplinary collaboration, and professional accountability.
- Incident reporting and root-cause review participation
- Evidence-based practice contributions
Notice that three domains - 1, 2, and 4 - are each weighted at 25%, making them collectively worth 75% of the exam. Domain 3 sits at 17% and Domain 5 trails at just 8%. If you only have time to deeply master three domains, make them 1, 2, and 4. For a domain-by-domain study breakdown with sample question logic, see CRN Exam Domains 2026: Complete Guide to All 5 Content Areas.
The Modality Blueprint: Interventional Radiology Dominates
Beyond the five practice-area domains, RNCB layers a second blueprint dimension based on imaging modality. This is easy to overlook but critical for prioritization:
- Interventional Radiology: 35% - the single heaviest modality weight on the entire exam
- CT: 20%
- MRI: 20%
- Diagnostic Imaging / Fluoroscopy / Breast Health: 15%
- Ultrasound / Vascular Ultrasound: 15%
- Nuclear Medicine / PET / Radiation Therapy: 15%
Cross-reference this against the domain weights, and a clear picture emerges: interventional radiology content, tested across Domains 1, 2, and 4, is your highest-yield study priority by a wide margin. A candidate who deeply understands sedation management, vascular access complications, and post-interventional monitoring will cover a disproportionate share of the exam compared to someone who spreads study time evenly across all six modalities.
Recertification: The 4-Year Clock
CRN certification is valid for 4 years. To maintain it, you choose one of two paths:
- Re-examination - retake and pass the current CRN exam, or
- 60 contact hours within the 4-year cycle, with a minimum of 30 hours being radiology-nursing-specific
Either path also requires maintaining an active RN license, logging 2,000 hours of radiology nursing practice within the past 4 years, and demonstrating current practice averaging 8 hours per week. Recertification fees mirror initial exam fees: $325 for members, $425 for non-members.
If you're weighing whether the ongoing recertification burden is justified by career payoff, Is the CRN Certification Worth It? Complete ROI Analysis 2026 and CRN Salary Guide 2026: Complete Earnings Analysis both dig into that calculation in depth.
Testing Windows and Scheduling Facts
The CRN exam is not offered continuously. It runs in four annual windows:
- January
- April
- July
- October
Each candidate gets a 30-day scheduling window to sit for the exam once approved, and applications typically close roughly one month before each testing window opens. Miss the deadline and you're looking at the $45 late fee (if within 14 days) or waiting for the next quarterly window entirely. For the full calendar and deadline logic, see CRN Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Key Takeaway
Apply at least 6-8 weeks before your target window closes. Verification signatures and CE documentation take longer to collect than most candidates expect.
One-Week Priority Map
If your exam date is close and you need to triage rather than build a full study plan, use domain and modality weights to allocate a final review week. This isn't generic study advice - it's built directly from the CRN's own blueprint math.
Interventional Radiology Across Domains 1, 2, 4
- Sedation protocols, vascular access complications, post-procedure monitoring
- Contrast reaction and emergency response scenarios tied to IR cases
CT and MRI Safety and Assessment
- Contrast screening, renal function, MRI safety zones and contraindications
Domain 3: Patient/Family Teaching
- Pre- and post-procedure education scripts, informed consent nuances
Remaining Modalities and Domain 5
- Ultrasound, nuclear medicine/PET basics, QA/CQI and professional practice concepts
Full Timed Practice
- Simulate the 150-question, 3-hour format under closed-book conditions
For a longer-horizon plan that builds toward this final week rather than compressing everything into it, see CRN Study Guide 2026: How to Pass on Your First Attempt. And if you're still calibrating how difficult this exam really is relative to your clinical background, How Hard Is the CRN Exam? Complete Difficulty Guide 2026 breaks that down further, while CRN Pass Rate 2026: What the Data Shows covers outcome data.
Quick Reference Table
| Fact | Detail |
|---|---|
| Administering body | RNCB (Radiologic Nursing Certification Board) |
| Test delivery | C-NET at regional testing centers |
| Question count | Up to 150 multiple-choice items |
| Testing time | 3 hours, closed book |
| Fee (ARIN member / non-member) | $325 / $425 |
| Late fee | $45, non-refundable, within 14 days |
| Practice hour requirement | 2,000 hours in past 3 years |
| CE hour requirement | 30 hours total, 15 radiology-specific, within 24 months |
| Testing windows | January, April, July, October |
| Scheduling window | 30 days per candidate |
| Certification validity | 4 years |
| Recertification CE option | 60 hours (min. 30 radiology-specific) in 4 years |
| Highest modality weight | Interventional Radiology at 35% |
| Accreditation | ABSNC, since July 2018 |
Curious how this fee and hour structure compares to the total investment across prep materials and CE courses? CRN Certification Cost 2026: Complete Pricing Breakdown lays out the full picture. And once you're certified, browsing CRN Jobs shows the kinds of interventional, CT, and MRI-heavy roles that specifically seek this credential.
Employers hiring for CRN-credentialed nurses are typically interventional radiology suites, CT/MRI departments in hospitals, outpatient imaging centers, and vascular access teams - settings where the modality blueprint's emphasis on IR, CT, and MRI directly reflects daily clinical demand. If terminology around the credential itself is still unclear, quick references like CRN Meaning, What Does CRN Stand For?, or What Is A CRN? clear that up fast.
For hands-on practice that mirrors the actual 150-question, 3-hour closed-book format, run through timed question sets on the main practice test platform before exam day. Repeated exposure to the pacing - not just the content - is what separates candidates who finish comfortably from those who rush the final 20 questions. Structured drills on our practice test site also help you spot which of the five domains still needs work before you commit to a testing window.
FAQs
No. The Radiologic Nursing Certification Board (RNCB) administers the CRN credential. ARIN is a separate professional association, and its members simply qualify for a discounted exam fee.
The exam has a maximum of 150 multiple-choice questions, and you have a total of 3 hours to complete it in a closed-book, computer-based format.
Interventional Radiology carries the single heaviest modality weight at 35%, and it overlaps heavily with the three 25%-weighted domains (assessment, therapeutic interventions, and safety/emergency management), making it the highest-yield study priority overall.
Testing runs in four annual windows - January, April, July, and October - each with its own application deadline roughly one month prior and a 30-day scheduling window once approved.
You must recertify either by passing the exam again or completing 60 contact hours (minimum 30 radiology-nursing-specific) within the 4-year cycle, while also maintaining an active RN license and 2,000 practice hours in radiology nursing.