FREE CNOR Study Guide 2026: A Complete, CCI-Aligned Walkthrough

This free CNOR study guide walks through everything the Certified Perioperative Nurse exam tests, organized into the same eight perioperative content areas the Competency & Credentialing Institute uses to build the exam.^[1]

It is interactive, not a wall of text: every area has worked exam-style scenarios, high-yield data tables, labeled diagrams, and built-in flashcards, all anchored to the primary sources the CNOR is written from — the AORN Guidelines for Perioperative Practice plus CDC, FDA, AAMI, OSHA, ASA, and MHAUS.

Read it area by area, then round out your prep with our practice test and flashcards. The CNOR is a specialty certification above RN licensure — it validates demonstrated competency in perioperative nursing, the care of the surgical patient before, during, and after surgery.

CNOR Exam Snapshot

The single largest scored area is intraoperative Patient Care and Safety at 25% — about 46 of the 185 scored questions — and the two intraoperative areas together make up 34%. Infection Prevention (16%) and Preoperative Assessment (15%) are the next priorities, so budget your study toward positioning, counts, sterilization, and assessment.^[1]

How the CNOR Is Structured & Scored

The CNOR is a fixed-form, 200-question multiple-choice exam. Of those, 185 are scored and 15 are unscored pretest items dispersed throughout and indistinguishable from scored ones — so answer every question as if it counts. You have 3 hours and 45 minutes, and in-person test-center candidates may take one unscheduled 10-minute break (RSPE candidates may not).^[1]

Scoring is criterion-referenced (a modified-Angoff standard), reported on a scaled score of 200 to 800; you must earn 620 or higher to pass. Because the scale is criterion-referenced, your result reflects your performance against a fixed standard, not a curve. You see a preliminary pass or no-pass on screen immediately; only candidates who do not pass receive a detailed diagnostic report.^[1]

To be eligible you need a current, unrestricted RN license and at least 2 years and 2,400 hours of perioperative experience, of which at least 1,200 hours (50%) must be intraoperative — there are no waivers (a reduced 18-month pathway applies to CFPN, CST, TS-C, or military-equivalent holders). Once approved, schedule and take the first attempt within 90 days; you may retake within a 12-month window with a minimum of 30 days between attempts.^[1][2]

1 · Pre/Postoperative Patient Assessment & Diagnosis

This area is 15% of the exam (about 28 scored questions) — the heaviest of the non-intraoperative areas. Master the ASA Physical Status scale, current NPO/fasting times, and the PACU Aldrete score cold; they generate items every cycle.^[1]

Preoperative Assessment & NPO Times

The preoperative assessment establishes the baseline, identifies risk, and drives the plan of care; it must be completed and documented before the patient enters the OR. Capture the health history (especially a personal or family history of malignant hyperthermia and prior anesthesia problems), comorbidities, medications, allergies, baseline vital signs, and a height/weight for BMI.

Document all allergies — latex is exam-critical: the highest-risk group is patients with spina bifida/myelomeningocele, latex cross-reacts with banana, avocado, kiwi, and chestnut, and at-risk patients are scheduled as the first case of the day in a latex-safe environment.

Fasting prevents pulmonary aspiration while avoiding needless dehydration. Memorize the ASA “2-4-6-8” minimums.^[6]

Reconcile medications: hold or bridge anticoagulants and antiplatelets per the surgeon, hold metformin per protocol, generally continue beta-blockers (do not abruptly stop), and flag bleeding-risk herbals — the “4 G’s” (garlic, ginger, ginkgo, ginseng), plus vitamin E and fish oil. Screen women of childbearing potential for pregnancy.

ASA Physical Status & Risk Tools

The ASA Physical Statusdescribes the patient’s preanesthetic systemic health. It is assigned by the anesthesia provider, but you must recognize each class.^[5]

Add an “E” suffix for an emergency (e.g., ASA III E). Other screening tools: the Caprini score for VTE risk (apply sequential compression devices before induction), the Braden Scale for pressure-injury risk (a lower score means higher risk; surgeries over 3 hours are high-risk), and Morse/Hendrich II for falls.

PACU Handoff & the Aldrete Score

The OR/anesthesia team gives a structured handoff to PACU. The immediate PACU priority follows ABC — airway and breathing first, then circulation, then consciousness, pain, and PONV. The Aldrete score objectively rates Phase I recovery.

A total of 9 or higher signals readiness for Phase I discharge. For Phase II (ambulatory discharge home), facilities use the PADSS (vital signs, ambulation, nausea/vomiting, pain, surgical bleeding). Watch for hypothermia — a core temperature below 36°C with shivering, cool skin, and prolonged emergence (distinct from the hyperthermia of MH).

Special Populations

Adjust the plan of care for special populations:

• Pediatric: a high surface-area-to-mass ratio means rapid heat loss; small blood losses are significant.
• Geriatric: decreased reserve, polypharmacy, fragile skin, and postoperative delirium risk.
• Bariatric: airway and OSA challenges (screen with STOP-BANG), equipment and dosing needs.
• Pregnant:use left uterine displacement after about 20 weeks and treat as a “full stomach” (aspiration risk).

2 · Individualized Plan of Care & Expected Outcomes

This area is 8% of the exam (about 15 scored questions). It tests how you move from assessment data to a standardized, measurable, patient-centered plan anchored in the Perioperative Nursing Data Set and the nursing process.^[4]

The Perioperative Nursing Data Set (PNDS)

The PNDSis AORN’s standardized perioperative nursing vocabulary and the first nursing specialty language recognized by the American Nurses Association. It is structured as standardized nursing diagnoses + interventions + nurse-sensitive outcomes, organized into domains — Safety, Physiologic responses, Behavioral responses (knowledge and rights), and Health System. Its purpose is to make perioperative care a common, measurable language that supports documentation, data aggregation, research, benchmarking, and quality improvement, linking nursing care to patient outcomes.

The plan follows the nursing process: Assess → Diagnose → Identify outcomes → Plan → Implement → Evaluate. A nursing diagnosis is problem + etiology (related to) + defining characteristics (as evidenced by); for a risk diagnosis, risk factors replace the defining characteristics.

Measurable Patient-Centered Outcomes

Expected outcomes are patient-centered, realistic, measurable, and time-bound (SMART), and they describe the patient’sstate, not the nurse’s task.

Prioritize by ABCs/Maslow; actual problems generally come before risk problems, but a high-probability, high-severity risk (an MH-susceptible patient, a fire-risk airway case) can take top priority.

Informed Consent & DNR in Planning

The four elements of valid informed consent are disclosure, comprehension, voluntariness, and competence/capacity. The surgeon obtains consent (disclosing risks, benefits, and alternatives); the nurse witnesses the signature, verifies the consent is complete and correct, advocates, and notifies the surgeon if the patient has questions. Verify consent before sedation.

3 · Intraoperative — Patient Care & Safety

This is the single largest scored area — 25% (about 46 questions). Positioning and nerve injury, the Universal Protocol, surgical counts, normothermia, the fire triangle, energy-device safety, prep/draping, and specimen integrity are the recurring testable anchors.^[4]

Surgical Positioning & Nerve Injury

Positioning is a shared responsibility, but the RN circulator advocates for and protects the anesthetized patient. Maintain physiologic alignment, pad bony prominences, keep arms abducted 90° or less with palms supinated to offload the ulnar nerve, and move the patient slowly.

Note: shoulder braces are not recommended in steep Trendelenburg (acromion compression injures the brachial plexus) — use non-sliding surfaces. Map the deficit to the nerve, position, and mechanism.

Universal Protocol & the Time-Out

The Joint Commission Universal Protocol has three parts: pre-procedure verification (correct patient with two identifiers, procedure, site, consent, labs, imaging), site marking (when more than one site is possible, by the licensed practitioner who will be present, with the patient involved, with an unambiguous mark visible after prep and draping), and the time-out.^[7]

The time-out is conducted immediately before incision, is initiated by a designated team member, requires the active participation of the entire team, and stops non-critical activity. The team verbally verifies the correct patient, procedure, and site, plus position, implants/equipment, images, antibiotic prophylaxis, and a fire-risk assessment — and it is documented. The WHO checkpoints integrate as Sign In (before anesthesia), Time Out (before incision), and Sign Out (before the patient leaves).

Surgical Counts & Retained Items

Counts prevent a retained surgical item (a never event and sentinel event; the most common is a soft-good sponge). Count soft goods, sharps, instruments, and miscellaneous items, performed by two people (one the RN circulator) concurrently, audibly, and visually.

When a count is incorrect, follow the algorithm without skipping a step. The patient is not closed or released until the count is reconciled or the surgeon documents a clinical decision otherwise. Adjunct technologies (RF detection, bar-coded sponges, radiography) supplement, never replace, the manual count.

Normothermia & Thermoregulation

Maintain perioperative normothermia (36°C or higher); hypothermia is below 36°C. Unplanned hypothermia increases surgical site infection, bleeding, and cardiac morbidity and delays emergence.

Forced-air warmingis the primary active method; prewarming, warmed IV/irrigation fluids, and warmed gases help. Measure and document temperature across all phases, and prevent thermal burns by following device instructions (never “free-hose” forced air).

Surgical Fire & Energy-Device Safety

A surgical fire needs all three legs of the fire triangle, and each is owned by a different team member — removing any one prevents fire.

Prevent fire by using the lowest effective FiO₂ (aim below 30% for open delivery), letting alcohol-based prep dry fully before draping, and holstering the active ESU tip. For a fire on the patient: stop the gases, remove burning material, extinguish (saline/water), then care for the patient. For a room fire use RACE (Rescue, Alarm, Contain, Extinguish/Evacuate) and PASS for the extinguisher.

For electrosurgery, place the dispersive (return) electrode on clean, dry, well-vascularized muscle close to the site with full uniform contact to prevent burns; return-electrode monitoring (REM/CQM) deactivates the unit if contact is inadequate. Bipolar needs no pad and is safer near implants.

Evacuate all surgical smoke (capture ≤2 inches from the source with a ULPA filter) — standard masks do not protect against plume. Tourniquets: roughly 200 mmHg upper / 250 mmHg lower (best set from limb-occlusion pressure), with maximum times near 60 min upper / 90 min lower, documenting total time.

Skin Prep, Draping & Medication Safety

Use alcohol-based chlorhexidine for most intact skin, prep from the incision site outward (the most contaminated area last), and never reposition a drape once placed. Moisture wicking from non-sterile to sterile (strike-through) contaminates the field. On the field, label all medications and solutions — including saline and water — even if only one is in use, and verify name and concentration aloud (read-back) between the circulator and scrub person.

Specimen Handling & MIS/Robotics

Specimen errors are a leading lab-safety problem. The surgeon states the specimen name, site/laterality, and instructions; the team confirms aloud. Label the container (not the lid) with two identifiers, source/site, and tests; routine permanents go in 10% formalin, but never put cultures or frozen-section specimens in formalin.

In MIS/robotics, monitor pneumoperitoneum (about 12–15 mmHg), guard against insulation failure and capacitive coupling, and remember the robotic patient is inaccessible once docked — rehearse emergent undocking for codes.

4 · Intraoperative — Personnel, Services & Materials

This area is 9% of the exam (about 17 scored questions). It covers perioperative team roles, delegation and scope of practice, the case-cart/supply system, and equipment and environmental controls.^[4]

Perioperative Team Roles

AORN requires one perioperative RN circulator dedicated to each patient for the entire procedure; the circulating role cannot be delegated because it requires independent nursing judgment. The scrub role may be filled by an RN, an LPN/LVN, or a surgical technologist — but when an RN scrubs, a separate RN must circulate, and an LPN/ST scrub works under the RN circulator’s supervision. The RNFA assists the surgeon and does not concurrently scrub or circulate.

Delegation, Supervision & Scope

Scope of practice is defined by the state Nurse Practice Act, not facility convenience. Delegation transfers the task, not the accountability — the RN stays accountable for the outcome.

You can never delegate the nursing process (assessment, diagnosis, planning, evaluation), teaching, or the circulating role. Apply the Five Rights of Delegation: right task, right circumstance, right person, right direction/communication, and right supervision/evaluation.

Case Carts, Equipment & Environment

A case cart is pre-assembled per the surgeon’s preference card and delivered from Sterile Processing; keep preference cards accurate to reduce waste. Open only what is needed — opened unused supplies are a major waste driver.

Reprocess single-use devices only via FDA-cleared reprocessors, and report device adverse events under the Safe Medical Devices Act/MedWatch. Know the OR environment numbers.

5 · Communication & Documentation

This area is 11% of the exam (about 20 scored questions). The facts are concrete and the right answers are usually the legally and ethically defensible ones — and the CNOR loves the rule that “if it was not documented, it was not done.”^[4]

The Intraoperative Nursing Record

The perioperative record is a legal document, communication tool, charge record, and quality data source. Documentation must be accurate, complete, legible, objective, timely, and contemporaneous. Correct a paper error with a single line, initials, and the date (the original must remain readable); label late entries as such and never backdate or erase.

High-yield items to document: the time-out, counts and their outcome, implants (lot/serial, size, expiration, placement), specimens, every labeled medication, positioning, the ESU dispersive-pad site and skin condition, and tourniquet pressure and total time.

Hand-off Communication (SBAR)

TJC identifies ineffective hand-off communication as a leading root cause of sentinel events. Use SBAR — Situation, Background, Assessment, Recommendation — for a standardized, interactive hand-off with read-back. The OR-to-PACU report is given jointly by the circulating RN and the anesthesia provider and includes the count outcome, antibiotics given and time, EBL, fluids/blood, and lines/drains.

Informed Consent & Confidentiality

Obtaining consent is the surgeon’s non-delegable duty; the nurse verifies the signed consent is present and correct before transfer, witnesses the signature, advocates, and documents. Witnessing attests the patient is the signer, signed voluntarily, and appears to have capacity — not that they understood every detail.

A sedated patient with new questions → stop and notify the surgeon; obtain consent before sedation. For HIPAA, apply minimum necessary, never post PHI on social media, and remember the OR schedule/board is PHI.

Just Culture & Variance Reporting

A just culture consoles human error, coaches at-risk behavior, and disciplines reckless behavior, encouraging non-punitive reporting of errors and near-misses. An occurrence/incident report is an internal QI tool — not part of the chart and never referenced in it; the chart documents the facts objectively. A sentinel event (retained item, wrong-site surgery, surgical fire) triggers a Root Cause Analysis.

6 · Infection Prevention & Control of Environment, Instrumentation & Supplies

This is the second-largest area — 16% (about 30 questions) and the most fact-dense, number-heavy domain. The exam rewards precise recall of sterilization parameters, the Spaulding classification, indicator types, and biological-indicator organisms.^[8][11]

Asepsis & the Sterile Field

Asepsis is the absence of pathogenic microorganisms; surgical asepsis keeps an area free of all microorganisms. The foundation rules: only sterile items touch sterile surfaces, sterile persons wear sterile gowns and gloves, tables are sterile only at table level, and when in doubt, consider it contaminated. Know exactly what is and is not sterile on a gown.

Strike-through (moisture wicking from non-sterile to sterile) contaminates the field. A break in technique requires immediate corrective action. For gloving, closed gloving has the lowest contamination risk for initial self-gloving, and double-gloving with a colored indicator under-glove reveals perforations.

Hand Antisepsis, Attire & Traffic

Surgical hand antisepsis uses either a traditional scrub with an antimicrobial agent (e.g., 4% chlorhexidine) or a waterless alcohol-based rub after a pre-wash — hold hands above the elbows and dry completely before gowning; artificial nails are prohibited. OR traffic moves through three zones — unrestricted → semi-restricted → restricted— with masks required in the restricted area when sterile supplies are open. OSHA’s Bloodborne Pathogens Standard requires PPE at no cost, a free hepatitis B vaccine, and post-exposure follow-up.^[13]

OR Environmental Controls

The OR runs positive pressure (air flows out), at least 20 total ACH (legacy ORs may run 15), 68–75°F, and 20–60% humidity, with HEPA-filtered downward airflow. Contrast this with an airborne-infection isolation room, which is negative pressure — do not confuse the two.

Spaulding & Disinfection

The CDC Spaulding classification sets the minimum reprocessing level by infection risk.^[8]

High-level disinfectants include glutaraldehyde (≥2.4%), OPA (0.55%), hydrogen peroxide, and peracetic acid. Reprocessing follows a fixed sequence — you cannot sterilize what is not clean.

Sterilization Methods & Monitoring

Steam is the gold standard (fast, nontoxic, least costly) — gravity cycles run about 30 min at 250°F (121°C); prevacuum cycles about 4 min at 270–275°F (132–135°C). Low-temperature methods handle heat-sensitive items.

Immediate-Use Steam Sterilization is permitted only when urgent and no other sterile item is available — never routinely; implants need a rapid-readout BI and quarantine.

Sterility assurance requires three monitors: mechanical (time/temperature/pressure), chemical indicators (CIs — Type 1 external process, Type 2 Bowie-Dick, Type 5 integrating, Type 6 emulating; CIs prove exposure, not sterility), and the biological indicator — the only direct proof of kill.

The Bowie-Dick test runs daily in an empty prevacuum chamber as the first cycle and tests air removal, not sterilization. Sterility is event-related, not date-based.

SSI Prevention & Precautions

The SSI-prevention bundle (CDC): give antibiotic prophylaxis within 60 minutes before incision (120 for vancomycin/fluoroquinolones), clip — do not shave (and only if necessary), use chlorhexidine-alcohol prep with full dry time, maintain normothermia, and control glucose.^[9] Apply standard precautions to every patient; add transmission-based precautions as needed (C. difficile = contact + soap-and-water + a sporicidal cleaner, because alcohol does not kill spores). Use a neutral (hands-free) zone for sharps and never recap needles.

7 · Emergency Situations

This area is 10% of the exam (about 19 scored questions) and one of the highest-stakes domains. CCI tests whether you know the earliest sign, the first action, and the exact drug and dose. Memorize the bolded numbers.^[14]

Malignant Hyperthermia

Malignant hyperthermia is a rare inherited hypermetabolic crisis triggered by volatile anesthetics and succinylcholine (an RYR1 defect causes uncontrolled calcium release). The earliest, most sensitive sign is a rising EtCO₂ unresponsive to ventilation; hyperthermia is a late sign — do not wait for fever.

Management (MHAUS): stop the triggers and call for help and the MH cart, hyperventilate with 100% oxygen, and give dantrolene 2.5 mg/kg IV rapidly, repeating as needed. Standard dantrolene (Dantrium/Revonto) is 20 mg/vial in 60 mL water (labor-intensive); Ryanodex is 250 mg/vial in just 5 mL — much faster.

Treat hyperkalemia and acidosis, cool actively (stop at <38°C), and avoid calcium channel blockers with dantrolene. The MHAUS hotline is 1-800-644-9737.^[14]

Hemorrhage & Transfusion Reactions

In hemorrhagic shock, tachycardia and a narrowed pulse pressure appear before hypotension (a late finding). Massive transfusion (≥10 units in 24 h, or ≥4 in 1 h with ongoing bleeding) uses a balanced 1:1:1 ratio; watch for hypothermia, hypocalcemia (citrate), and hyperkalemia. For any suspected transfusion reaction: STOP the transfusion, keep the line open with normal saline, and notify the provider and blood bank.

Anaphylaxis & LAST

For anaphylaxis (in the OR, often neuromuscular blockers, antibiotics, or latex), the first and definitive drug is epinephrine; stop the agent, give 100% oxygen, and run fluids. Latex anaphylaxis is prevented with a latex-safe room and a first-case schedule. LAST shows CNS signs first (perioral numbness, metallic taste, tinnitus, seizures) then cardiovascular collapse; the antidote is 20% lipid emulsion— 100 mL bolus (≥70 kg) or 1.5 mL/kg (<70 kg), then 0.25 mL/kg/min, max ~12 mL/kg — with reduced epinephrine (≤1 mcg/kg) and benzodiazepines for seizures.^[15]

Arrest, Awareness, VAE & Fire

For cardiac arrest, give high-quality CPR (100–120/min, 2–2.4 in deep) and defibrillate shockable rhythms early; for asystole/PEA give epinephrine 1 mg every 3–5 minutes and hunt the H’s and T’s. Anesthesia awareness (explicit recall under general anesthesia, higher risk with TIVA) is reduced with depth-of-anesthesia monitoring.

For a venous air embolism (highest risk in the sitting position; a sudden EtCO₂ drop is the most sensitive sign), use the Durant maneuver — left lateral decubitus + Trendelenburg, stop nitrous oxide, and give 100% oxygen. For a surgical fire on the patient, stop the gases, remove burning material, extinguish, then care for the patient.

8 · Professional Accountability

This area is 6% of the exam (about 10 scored questions). It is concept-and-definition heavy: know the AORN standards, the ANA Code of Ethicsand the four ethical principles, the nurse’s role in consent and advocacy, and the distinct jobs of the regulatory bodies.^[16]

Scope, Standards & Ethics

AORNdefines evidence-based perioperative practice (Guidelines, Scope & Standards, position statements) and requires an RN circulator for every patient. The perioperative RN is the anesthetized patient’s primary advocate, and anyone on the team can stop the line for a safety concern.

The four core ethical principles are autonomy (self-determination — consent, refusals, advance directives), beneficence (do good), nonmaleficence (do no harm — correct counts/site, sterile technique), and justice (fairness). ANA Code Provision 2: the nurse’s primary commitment is to the patient.

Regulatory & Accreditation Bodies

The most commonly missed factual cluster — learn each body’s distinct jurisdiction.

How to Use This Study Guide

Work through the guide one CCI content area at a time. After each area, check it off in the contents to raise your exam-readiness score, then drill the same content in our free practice test and flashcards — active recall and timed practice are what move knowledge into exam-day performance.

• Weight your time by the blueprint. The intraoperative areas (34%), Infection Prevention (16%), and Preoperative Assessment (15%) carry the most points — start there.
• Answer from AORN. When options conflict on “best practice,” the AORN-recommended action is almost always the keyed answer.
• Memorize the high-frequency facts. NPO times, ASA classes, the count sequence, sterilization parameters, BI organisms, and emergency drugs/doses appear again and again.
• Drill the “first action” reflexes. Incorrect count → inform surgeon; transfusion reaction → stop the transfusion; MH → dantrolene; VAE → Durant maneuver.
• Study to mastery. Because the pass standard is a fixed 620 scaled score, aim for consistent mastery rather than a bare percentage.

Common questions candidates search and get asked — each answered briefly and backed by an official source (CCI, AORN, CDC, FDA, AAMI, MHAUS, ASA, TJC, or ASRA). Tap any card to test yourself.

CNOR Glossary

Key CNOR terms in one place. Hover any dotted term throughout the guide for its definition; the full list is below.

CNOR

The Certified Perioperative Nurse credential offered by the Competency & Credentialing Institute (CCI). CCI notes that "CNOR is not an acronym" — the letters do not stand for specific words.

CCI

Competency & Credentialing Institute — the body that develops and administers the CNOR exam (delivered through PSI).

AORN

Association of periOperative Registered Nurses — publisher of the Guidelines for Perioperative Practice, the dominant clinical authority for OR practice and the main source the CNOR is built on.

perioperative nursing

Nursing care of the surgical patient across the preoperative, intraoperative, and postoperative phases.

RN circulator

The non-sterile RN dedicated to one patient for the entire procedure who advocates for the patient, manages the room, performs counts with the scrub person, and documents — a role that cannot be delegated.

scrub role

The sterile role that sets up and maintains the sterile field and passes instruments; may be filled by an RN, an LPN/LVN, or a surgical technologist.

RNFA

RN First Assistant — a perioperative RN with additional formal education who assists the surgeon (retraction, hemostasis, suturing) and does not concurrently scrub or circulate.

ASA Physical Status

The American Society of Anesthesiologists' six-class scale (I–VI, +E for emergency) describing a patient's preanesthetic systemic health.

NPO

Nil per os (nothing by mouth) — the preoperative fasting period; the ASA "2-4-6-8" minimums are 2 h clear liquids, 4 h breast milk, 6 h formula/light meal, 8 h fatty/full meal.

Aldrete score

A five-parameter PACU recovery score (activity, respiration, circulation, consciousness, oxygen saturation), each 0–2, max 10; a score of 9 or higher signals Phase I discharge readiness.

normothermia

A core body temperature of 36.0–38.0°C (96.8–100.4°F); maintaining it reduces surgical site infection, bleeding, and cardiac complications.

PNDS

Perioperative Nursing Data Set — AORN's standardized perioperative nursing vocabulary and the first nursing specialty language recognized by the ANA.

Universal Protocol

The Joint Commission process to prevent wrong-site/-procedure/-person surgery: pre-procedure verification, site marking, and a time-out.

time-out

A pause immediately before incision in which the entire team verbally verifies the correct patient, procedure, and site before starting.

surgical count

A concurrent, audible, visual tally of sponges, sharps, instruments, and miscellaneous items by the RN circulator and scrub person to prevent retained surgical items.

retained surgical item

An item unintentionally left in a patient after surgery — a "never event" and a Joint Commission sentinel event; the most common is a soft-good sponge.

fire triangle

The three elements a surgical fire needs — an oxidizer (anesthesia), an ignition source (surgeon), and fuel (RN circulator/team); removing any one prevents fire.

ESU

Electrosurgical unit — monopolar current passes from the active electrode through the patient to a dispersive (return) electrode; correct pad placement prevents burns.

dispersive electrode

The return pad placed on clean, dry, well-vascularized muscle close to the site with full contact, so current returns safely without a patient burn.

asepsis

The absence of pathogenic microorganisms; surgical (sterile) asepsis keeps an area free of all microorganisms.

sterile field

The area around the surgical site created and kept free of microorganisms; only sterile items touch sterile surfaces, and when in doubt an item is contaminated.

strike-through

Moisture wicking from a non-sterile surface to a sterile one, which contaminates the field.

Spaulding classification

The CDC scheme that sets reprocessing by infection risk: critical → sterilize, semicritical → high-level disinfection, noncritical → low/intermediate disinfection.

high-level disinfection

Reprocessing that kills all microorganisms except large numbers of bacterial spores; the minimum for semicritical items such as flexible endoscopes.

IUSS

Immediate-Use Steam Sterilization (formerly "flash") of a cleaned, unwrapped item for immediate use — permitted only when urgent and no other sterile item exists, never routinely.

biological indicator

A test containing live, highly resistant spores — the only direct proof a sterilization process killed microorganisms (no growth = pass).

Bowie-Dick test

A daily air-removal test run in an empty prevacuum sterilizer chamber as the first cycle of the day; it tests air removal, not sterilization.

event-related sterility

The standard that a package stays sterile until an event compromises it (wet, torn, dropped), rather than by an arbitrary expiration date.

standard precautions

Infection-control measures applied to every patient at all times, treating all blood and body fluids as infectious; hand hygiene is the most important.

malignant hyperthermia

A rare inherited hypermetabolic crisis triggered by volatile anesthetics and succinylcholine; the earliest sign is a rising EtCO₂ and the treatment is dantrolene.

dantrolene

The direct skeletal-muscle relaxant that treats malignant hyperthermia by blocking calcium release at the RYR1 receptor; initial dose 2.5 mg/kg IV, repeated to effect.

LAST

Local Anesthetic Systemic Toxicity — toxic plasma levels causing CNS then cardiac signs; treated with 20% lipid emulsion plus modified ACLS.

transfusion reaction

An adverse response to transfused blood; the first action for any suspected reaction is to stop the transfusion and keep the line open with normal saline.

venous air embolism

Air entering an open vein when the surgical site is above the heart; treated with the Durant maneuver (left lateral decubitus + Trendelenburg) and 100% oxygen.

sentinel event

A patient-safety event reaching the patient that causes death, permanent harm, or severe temporary harm (e.g., retained item, wrong-site surgery, surgical fire).

just culture

A safety model that consoles human error, coaches at-risk behavior, and disciplines reckless behavior, encouraging non-punitive reporting.

ANA Code of Ethics

The American Nurses Association's non-negotiable ethical standard; its core principles are autonomy, beneficence, nonmaleficence, and justice.

CNOR Study Guide FAQ

References

1. 1.Competency & Credentialing Institute (CCI). “CNOR Candidate Handbook (Version 5.2026).” CCI. ↑
2. 2.Competency & Credentialing Institute (CCI). “CNOR Certification.” cc-institute.org. ↑
3. 3.Competency & Credentialing Institute (CCI). “CNOR Recertification.” cc-institute.org. ↑
4. 4.Association of periOperative Registered Nurses (AORN). “Guidelines for Perioperative Practice.” AORN. ↑
5. 5.American Society of Anesthesiologists (ASA). “ASA Physical Status Classification System.” ASA. ↑
6. 6.American Society of Anesthesiologists (ASA). “Practice Guidelines for Preoperative Fasting (2017; 2023 update).” ASA. ↑
7. 7.The Joint Commission (TJC). “The Universal Protocol.” jointcommission.org. ↑
8. 8.Centers for Disease Control and Prevention (CDC). “Guideline for Disinfection and Sterilization in Healthcare Facilities (Spaulding classification).” CDC. ↑
9. 9.Centers for Disease Control and Prevention (CDC). “Guideline for the Prevention of Surgical Site Infection.” CDC. ↑
10. 10.Centers for Disease Control and Prevention (CDC). “Standard Precautions for All Patient Care.” CDC. ↑
11. 11.Association for the Advancement of Medical Instrumentation (AAMI). “ANSI/AAMI ST79 — Steam sterilization and sterility assurance.” AAMI. ↑
12. 12.U.S. Food and Drug Administration (FDA). “Ethylene Oxide Sterilization for Medical Devices.” FDA. ↑
13. 13.Occupational Safety and Health Administration (OSHA). “Bloodborne Pathogens Standard (29 CFR 1910.1030).” OSHA. ↑
14. 14.Malignant Hyperthermia Association of the United States (MHAUS). “Managing a Malignant Hyperthermia Crisis.” mhaus.org. ↑
15. 15.American Society of Regional Anesthesia and Pain Medicine (ASRA). “Checklist for Treatment of Local Anesthetic Systemic Toxicity (LAST).” asra.com. ↑
16. 16.American Nurses Association (ANA). “Code of Ethics for Nurses with Interpretive Statements.” nursingworld.org. ↑
17. 101.Association of periOperative Registered Nurses (AORN). “Perioperative Nursing Data Set (PNDS).” aorn.org, accessed 18 June 2026. ↑

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