The CNOR is the gold-standard certification for perioperative registered nurses, administered by the Competency and Credentialing Institute (CCI). It validates advanced knowledge across the entire perioperative continuum, preoperative assessment, intraoperative care, postoperative recovery, and the professional and quality dimensions of OR nursing. CNOR is recognized by AORN (Association of periOperative Registered Nurses) as the credential of choice for OR nurses, and it's widely required or strongly preferred for surgical-services leadership positions and Magnet-designated organizations. A CNOR on your badge typically opens doors to charge-nurse, educator, and clinical-coordinator roles, and frequently a pay differential.
CNOR
CNOR
Certified Perioperative Nurse
Become a certified perioperative nurse with comprehensive exam prep.
Free forever. No credit card. Aligned to the Competency and Credentialing Institute (CCI) blueprint.
At a glance
CNOR exam facts
- Questions
- 200 (165 scored + 35 unscored pretest)
- Duration
- 3 hours 45 minutes
- Passing score
- Scaled score of 620 or above on a 200-800 scale
- Cost
- $370 for AORN members; $470 for non-members
- Format
- Multiple choice, computer-based at PSI testing centers
- When offered
- Year-round at PSI testing centers
Intraoperative care is 35% of the exam. Count procedures, sterilization parameters, and AORN-recommended practices appear on virtually every form. Anchor your study in *Perioperative Standards and Recommended Practices*.
Exam blueprint
What the CNOR tests
The categories below come from the current Competency and Credentialing Institute (CCI) test plan. Weights are the published ranges; the actual percentage varies slightly between exam forms.
Preoperative Patient Assessment, Diagnosis, Outcome Identification, and Planning
~15%Patient assessment, risk identification, planning, and pre-induction teaching. Smaller weight but predictable content, drill the universal-protocol time-out and pre-induction checklist cold.
Intraoperative Care
~35%The biggest single category. Patient and family communication, surgical positioning, prepping and draping, **count procedures**, specimen management, hemostasis, and emergency response. Most candidates who fail miss it here.
Communication, Transfer of Care, and Postoperative Care
~15%Hand-off communication, PACU report, continuity-of-care documentation. SBAR-style framing dominates correct answers.
Instrument Processing and Supply Management
~10%Cleaning, disinfection, sterilization, package integrity, and load monitoring. Memorize sterilization parameters cold (steam, EO, low-temperature).
Emergency Situations
~10%**Malignant hyperthermia** (recognition, dantrolene, MH cart contents), fire safety (the fire triangle), cardiac arrest, surgical hemorrhage. Small weight, high stakes, every question is answerable from a clear knowledge base.
Management of Personnel, Services, and Materials
~10%Staffing, supervision, supply management, and surgical-services leadership.
Professional Accountability
~5%Ethics, evidence-based practice, quality improvement, AORN standards.
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Eligibility requirements
To sit for the CNOR you must:
- Hold a current, unrestricted RN license.
- Have worked a minimum of two years and 2,400 hours in perioperative nursing.
- Have at least 1,200 hours in the intraoperative setting within those two years.
- Be currently employed (full or part-time) in perioperative nursing.
Confirm the current eligibility criteria on the CCI website before applying. CCI verifies hours through your employer, start logging your perioperative hours by phase (preop, intraop, PACU) so you can document them quickly when you apply.
Working from the CNOR Exam Reference List
CCI publishes a detailed CNOR Exam Reference List and a content outline. Use both as your study map. The Reference List names the specific sources CCI draws exam questions from, and **AORN's *Perioperative Standards and Recommended Practices* is the most heavily cited source on the exam**.
If you read one source cover to cover, read AORN. Pay particular attention to count procedures, sterilization parameters, surgical fire risk assessment, malignant hyperthermia protocols, and prepping/draping. Those areas don't just appear often, the correct answer is almost always whichever option matches AORN's recommendation exactly.
High-yield topics worth extra time
Across recent test forms, candidates consistently report extra weight on:
- Surgical count procedures, initial count, ongoing counts, discrepancy management, retained-item prevention.
- Malignant hyperthermia, early signs (rising EtCO2, masseter rigidity, hyperthermia is *late*), dantrolene dosing, MH cart contents.
- Surgical fire safety, the fire triangle (oxidizer, ignition source, fuel), high-risk procedures, prevention bundles.
- Sterilization parameters, steam (temperature/time/pressure for gravity and pre-vacuum), ethylene oxide, low-temperature hydrogen peroxide and ozone.
- Surgical positioning, pressure points, nerve injury risks by position (lithotomy, lateral, prone).
- Prepping and draping, antiseptic dry times, sterile field maintenance, traffic patterns.
If any of these feel uncertain, prioritize them in your first study pass. They're foundational and they recur on the exam.
Preparing for CNOR
Most successful candidates study 3 to 6 months for the CNOR. A typical sprint:
- Months 1-2: Read AORN's *Perioperative Standards and Recommended Practices* cover to cover. Take notes on count procedures, sterilization, MH, fire safety, and positioning.
- Months 2-4: Daily review of weak topics, 25-50 practice questions per day. Use the AORN CNOR review course or a commercial review book.
- Final 6-8 weeks: Ramp question practice to 50 per day. Drill intraoperative care (35% of exam).
- Final 2 weeks: Two full-length timed simulations. Build 3-hour-45-minute endurance.
Don't try to learn perioperative nursing through CNOR review books alone. They're abstracts; AORN is the source.
Sample questions
Practice CNOR questions
Reveal each answer and rationale to see how Precision Nursing teaches the reasoning behind every question.
Question 1
Intraoperative CareDuring a laparotomy, the surgical count at the end of the case is incorrect by one sponge. What is the circulating nurse's most appropriate first action?
- A.Document the discrepancy and request an x-ray after the patient leaves the OR.
- B.Notify the surgeon and conduct a thorough recount before the wound is closed.
- C.Close the wound as scheduled and call radiology in the PACU.
- D.Send the patient to PACU and recount sponges off the field.
Show answer & rationale
Correct answer: B
AORN's recommended practice for count discrepancies requires immediate notification of the surgeon and a thorough recount before wound closure. If the sponge cannot be located, intraoperative imaging is performed before the wound is closed. Closing the wound and imaging later increases the risk of a retained surgical item.
Question 2
Emergency SituationsMalignant hyperthermia is suspected in an anesthetized patient. Which medication is the priority?
- A.Propofol
- B.Dantrolene sodium
- C.Succinylcholine
- D.Atropine
Show answer & rationale
Correct answer: B
Dantrolene sodium is the antidote for malignant hyperthermia and must be administered as quickly as possible to interrupt the hypermetabolic state. Succinylcholine and certain volatile anesthetics are triggers of MH and must be discontinued. Propofol and atropine are not the priority intervention.
Study tips
What works for CNOR prep
Anchor your study in AORN's *Perioperative Standards and Recommended Practices*. It's the most-cited source on the exam.
Drill count procedures and discrepancy protocols until they're reflex. They appear on virtually every form.
Memorize sterilization parameters for steam, EO, and low-temperature systems cold.
Know malignant hyperthermia recognition (rising EtCO2 first, hyperthermia late) and the full MH cart contents.
Walk through the surgical fire triangle and high-risk procedure bundles.
Practice 50 questions per day for the last 8 weeks before the exam.
Sit at least one full-length 200-question timed simulation. 3:45 is a long sit, build endurance.
FAQ
Common questions about CNOR
Who is the CNOR for?
Registered nurses with at least two years and 2,400 hours of perioperative nursing experience, including at least 1,200 intraoperative hours.
How long is the CNOR exam?
3 hours 45 minutes, with 200 questions (165 scored, 35 pretest).
What is the passing score?
A scaled score of 620 or above on a 200-800 scale.
How much does the CNOR cost?
$370 for AORN members; $470 for non-members.
How long is the CNOR valid?
5 years. Maintain via continuing education and professional activities documented through CCI's accrual program, or by retesting.
Is CNOR required for OR nurses?
Not legally required, but it is widely preferred or required for charge nurse, educator, and management roles, especially in Magnet-designated organizations. Many hospitals pay a CNOR differential.
Can I retake the CNOR if I fail?
Yes. CCI permits a retake after 90 days with a new application and exam fee. Use your score report's category-level feedback to focus the retake plan.
Honest answers
Before you sign up, three things you're probably wondering
“Is the free tier actually useful, or just a teaser?”
1,000+ full-rationale questions across every CNOR blueprint category. No time limit. No paywall after the first five.
“Is it like the real exam?”
Same format, same difficulty curve, same item types, built directly against the Competency and Credentialing Institute (CCI) published test plan. We're not the test-makers, but we follow their blueprint.
“Why not use the official free samples?”
Use both. The official samples are small and authoritative. We give you the volume, the rationales, and the weak-area analytics on top.
Your CNOR prep starts here
Drill CNOR-style questions until passing is the obvious outcome
Thousands of CNOR-aligned questions. Full rationales on every answer, right and wrong. Adaptive practice that mirrors the real exam. No credit card required to start.
Free forever. No credit card. Aligned to the Competency and Credentialing Institute (CCI) published test plan.