CNOR EXAM REVIEW | COMPLETE CERTIFIED NURSE OPERATING ROOM (CNOR) STUDY GUIDE, PRACTICE QUESTIONS & CERTIFICATION PREP 2026/2027

CNOR EXAM REVIEW | COMPLETE CERTIFIED NURSE OPERATING ROOM (CNOR) STUDY
GUIDE, PRACTICE QUESTIONS & CERTIFICATION PREP 2026/2027



CNOR exam: governing body and credential? - ANS ✔✔The CNOR credential is administered by
the Competency & Credentialing Institute (CCI) and validates perioperative nursing knowledge
and skills for the RN in the OR. :content Reference[oaicite:1]{index=1}



CNOR exam: broad content domains you must master - ANS ✔✔Per CCI's blueprint, focus on
preop assessment/diagnostics, sterilization/asepsis, intraop nursing care & safety,
instrumentation/equipment, anesthesia & meds safety, documentation, and
professional/leadership concepts. :contentReference[oaicite:2]{index=2}



Spaulding classification: define categories - ANS ✔✔• Critical: contact sterile tissue/vascular
system → sterilize. • Semicritical: contact mucous membranes/non-intact skin → high-level
disinfection (HLD) at minimum. • Noncritical: contact intact skin → low/intermediate-level
disinfection. :contentReference[oaicite:3]{index=3}



Steam sterilization: typical gravity cycle parameters - ANS ✔✔Common wrapped gravity-
displacement cycle: 121 °C (250 °F) for 30 minutes (exposure) with adequate drying; follow
device IFU. :contentReference[oaicite:4]{index=4}



Steam sterilization: typical prevacuum cycle parameters - ANS ✔✔Common wrapped pre-
vacuum cycle: 132 °C (270 °F) for 4 minutes (exposure) with adequate drying; follow device
IFU. :contentReference[oaicite:5]{index=5}



Biological indicator (BI) organism for steam - ANS ✔✔Geobacillus stearothermophilus spores
are used to biologically monitor steam sterilization efficacy. :contentReference[oaicite:6]
{index=6}



Bowie-Dick test: purpose & frequency - ANS ✔✔Used daily (before the first processed load) in
pre-vacuum steam sterilizers to detect adequate air removal/steam penetration (presence of
residual air/leaks). :contentReference[oaicite:7]{index=7}

, Chemical indicator (CI) classes: know the spectrum - ANS ✔✔Class 1 process indicators; Class 2
for specific tests (e.g., Bowie-Dick); Classes 3-6 provide increasing sensitivity/single-parameter
up to emulating exposure conditions; always supplement but never replace
BI. :contentReference[oaicite:8]{index=8}



Event-related sterility vs. time-related - ANS ✔✔Modern practice is event-related sterility: items
remain sterile until compromised by events (moisture/pack damage), not a fixed date—unless
IFU/policy states otherwise. :contentReference[oaicite:9]{index=9}



Immediate-Use Steam Sterilization (IUSS): appropriate use - ANS ✔✔Limited to urgent
situations when no alternative is available; not for implants (unless documented urgent need
and BI monitoring) and requires cleaning, correct packaging/trays, and complete
documentation. :contentReference[oaicite:10]{index=10}



Decontamination basics before sterilization - ANS ✔✔Preclean at point of use, keep instruments
moist, transport safely to decon, use enzymatic/neutral pH detergents and water quality per
IFU, inspect and assemble correctly before packaging. :contentReference[oaicite:11]{index=11}



OR pressure & ventilation essentials - ANS ✔✔ORs are maintained at positive pressure to
adjacent areas; sufficient air changes per hour (commonly ≥15-20 ACH) to dilute contaminants;
maintain pressure monitors and door discipline. :contentReference[oaicite:12]{index=12}



OR temperature & humidity ranges - ANS ✔✔Typical recommended OR temperature 68-75 °F
(20-24 °C) and relative humidity 20-60% per AORN/ASHRAE-aligned guidance and many
accreditor expectations. Follow facility policy. :contentReference[oaicite:13]{index=13}



Sterile storage room HVAC basics - ANS ✔✔Sterile storage should be positive pressure, ≤60%
RH, and within ~72-78 °F with minimum air exchanges per ASHRAE 170; monitor and document.
:contentReference[oaicite:14]{index=14}