CNOR Final Exam 2026: 150 Questions, Answers,
and Detailed Rationales | Instant PDF Download
Study Guide
CNOR FINAL EXAM: VERSION 1
Focus: Surgical Environment, Safety, and Sterile Technique (Questions 1–50)
1. According to AORN guidelines, what is the recommended humidity range for
the Operating Room to inhibit microbial growth?
A) 10% – 30%
B) 20% – 60%
C) 40% – 80%
D) 50% – 70%
Maintaining humidity between 20% and 60% reduces the risk of electrostatic discharge
(fire safety) and prevents the environmental conditions that allow bacteria to flourish.
Answer: B
2. Which type of fire extinguisher is mandatory for use on fires involving
electrical equipment or lasers in the OR?
A) Water (Type A)
B) Halon or CO2 (Type C)
C) Foam (Type B)
D) Dry Powder
Type C extinguishers are non-conductive. Unlike dry powder, Halon/CO2 does not
leave a corrosive residue that would destroy delicate surgical optics and electronics.
Answer: B
3. During the mandatory "Time-Out," which activity is permitted to continue by
the scrub person?
A) Setting up the back table
B) Counting sponges with the circulator
C) Loading sutures onto drivers
D) No activity; a complete "hard stop" is required.
,AORN and The Joint Commission require a total cessation of all clinical activity to
ensure 100% focus on verifying the correct patient, site, and procedure. Answer: D
4. When a sterile person is passing another sterile person in the OR, how should
they move?
A) Face-to-back
B) Back-to-back or Face-to-face
C) Side-to-side
D) Any direction is acceptable
To maintain the sterile field, "back-to-back" is preferred as the backs of gowns are
considered unsterile. Moving "face-to-face" allows both parties to see and avoid
contamination. Answer: B
5. What is the minimum number of air exchanges required per hour in the
Operating Room to maintain air quality?
A) 10
B) 15
C) 20
D) 30
AORN standards require at least 20 air exchanges per hour, with at least 4 of those
being fresh outdoor air, to dilute and remove contaminants. Answer: C
6. Which skin prep agent is contraindicated for use on or near the eyes, ears, or
meninges due to neurotoxicity?
A) Povidone-Iodine
B) Chlorhexidine Gluconate (CHG)
C) 70% Isopropyl Alcohol
D) PCMX
CHG can cause permanent hearing loss (ototoxicity) and corneal damage. It should
never be used for procedures involving the middle ear or brain tissue. Answer: B
7. "Bioburden" refers to which of the following in the sterile processing cycle?
A) The weight of the surgical instrument tray
,B) The number of microorganisms contaminating an object before sterilization
C) The chemicals left behind by ethylene oxide
D) The protective coating on stainless steel
Effective cleaning is the most important step because high bioburden can shield
microorganisms from the sterilant (steam or gas). Answer: B
8. If a sterile person’s gown becomes contaminated during a procedure, how
should it be changed?
A) The scrub person removes it themselves
B) The circulator pulls the gown off from the shoulders, turning it inside out.
C) The surgeon helps remove it
D) Wipe the area with alcohol and continue
The circulator should pull the gown forward and away from the body to ensure the
contaminated front does not touch the scrub person's skin or attire. Answer: B
9. What is the standard temperature range for a surgical suite according to
AORN?
A) 60°F – 65°F
B) 68°F – 75°F
C) 75°F – 80°F
D) 65°F – 70°F
While surgeons often prefer cooler rooms, this range balances patient normothermia
(preventing hypothermia) with staff comfort and infection control. Answer: B
10. When opening a sterile wrapper, which flap should be opened first?
A) The flap closest to the person
B) The side flaps
C) The flap farthest from the person
D) It does not matter
Opening the farthest flap first prevents the unsterile arm from reaching over the sterile
contents when opening the remaining flaps. Answer: C
, 11. Which member of the surgical team is responsible for documentation and
managing the room environment?
A) Scrub Person
B) Circulating Nurse
C) Surgical Assistant
D) Anesthesiologist
The circulator is the patient's primary advocate, responsible for the nursing process,
safety, and coordination of all unsterile activities. Answer: B
12. "Strike-through" contamination occurs when:
A) A person reaches over a sterile field
B) Moisture soaks through a sterile drape, allowing microorganisms to migrate
through.
C) An instrument is dropped on the floor
D) The air pressure in the room is negative
Drapes are no longer an effective barrier if they become wet. This is why moisture-
resistant or plastic-reinforced drapes are used for high-fluid cases. Answer: B
13. What is the first priority when an "Active Fire" is identified on the patient
during surgery?
A) Call for help
B) Remove the burning materials from the patient.
C) Aim the fire extinguisher at the patient
D) Turn off the oxygen
The immediate goal is to limit the burn injury to the patient. Stop the flow of breathing
gases (O2) and remove the drapes/burning material simultaneously. Answer: B
14. A "Bowie-Dick" test is used in which type of sterilizer to check for air
removal?
A) Gravity displacement
and Detailed Rationales | Instant PDF Download
Study Guide
CNOR FINAL EXAM: VERSION 1
Focus: Surgical Environment, Safety, and Sterile Technique (Questions 1–50)
1. According to AORN guidelines, what is the recommended humidity range for
the Operating Room to inhibit microbial growth?
A) 10% – 30%
B) 20% – 60%
C) 40% – 80%
D) 50% – 70%
Maintaining humidity between 20% and 60% reduces the risk of electrostatic discharge
(fire safety) and prevents the environmental conditions that allow bacteria to flourish.
Answer: B
2. Which type of fire extinguisher is mandatory for use on fires involving
electrical equipment or lasers in the OR?
A) Water (Type A)
B) Halon or CO2 (Type C)
C) Foam (Type B)
D) Dry Powder
Type C extinguishers are non-conductive. Unlike dry powder, Halon/CO2 does not
leave a corrosive residue that would destroy delicate surgical optics and electronics.
Answer: B
3. During the mandatory "Time-Out," which activity is permitted to continue by
the scrub person?
A) Setting up the back table
B) Counting sponges with the circulator
C) Loading sutures onto drivers
D) No activity; a complete "hard stop" is required.
,AORN and The Joint Commission require a total cessation of all clinical activity to
ensure 100% focus on verifying the correct patient, site, and procedure. Answer: D
4. When a sterile person is passing another sterile person in the OR, how should
they move?
A) Face-to-back
B) Back-to-back or Face-to-face
C) Side-to-side
D) Any direction is acceptable
To maintain the sterile field, "back-to-back" is preferred as the backs of gowns are
considered unsterile. Moving "face-to-face" allows both parties to see and avoid
contamination. Answer: B
5. What is the minimum number of air exchanges required per hour in the
Operating Room to maintain air quality?
A) 10
B) 15
C) 20
D) 30
AORN standards require at least 20 air exchanges per hour, with at least 4 of those
being fresh outdoor air, to dilute and remove contaminants. Answer: C
6. Which skin prep agent is contraindicated for use on or near the eyes, ears, or
meninges due to neurotoxicity?
A) Povidone-Iodine
B) Chlorhexidine Gluconate (CHG)
C) 70% Isopropyl Alcohol
D) PCMX
CHG can cause permanent hearing loss (ototoxicity) and corneal damage. It should
never be used for procedures involving the middle ear or brain tissue. Answer: B
7. "Bioburden" refers to which of the following in the sterile processing cycle?
A) The weight of the surgical instrument tray
,B) The number of microorganisms contaminating an object before sterilization
C) The chemicals left behind by ethylene oxide
D) The protective coating on stainless steel
Effective cleaning is the most important step because high bioburden can shield
microorganisms from the sterilant (steam or gas). Answer: B
8. If a sterile person’s gown becomes contaminated during a procedure, how
should it be changed?
A) The scrub person removes it themselves
B) The circulator pulls the gown off from the shoulders, turning it inside out.
C) The surgeon helps remove it
D) Wipe the area with alcohol and continue
The circulator should pull the gown forward and away from the body to ensure the
contaminated front does not touch the scrub person's skin or attire. Answer: B
9. What is the standard temperature range for a surgical suite according to
AORN?
A) 60°F – 65°F
B) 68°F – 75°F
C) 75°F – 80°F
D) 65°F – 70°F
While surgeons often prefer cooler rooms, this range balances patient normothermia
(preventing hypothermia) with staff comfort and infection control. Answer: B
10. When opening a sterile wrapper, which flap should be opened first?
A) The flap closest to the person
B) The side flaps
C) The flap farthest from the person
D) It does not matter
Opening the farthest flap first prevents the unsterile arm from reaching over the sterile
contents when opening the remaining flaps. Answer: C
, 11. Which member of the surgical team is responsible for documentation and
managing the room environment?
A) Scrub Person
B) Circulating Nurse
C) Surgical Assistant
D) Anesthesiologist
The circulator is the patient's primary advocate, responsible for the nursing process,
safety, and coordination of all unsterile activities. Answer: B
12. "Strike-through" contamination occurs when:
A) A person reaches over a sterile field
B) Moisture soaks through a sterile drape, allowing microorganisms to migrate
through.
C) An instrument is dropped on the floor
D) The air pressure in the room is negative
Drapes are no longer an effective barrier if they become wet. This is why moisture-
resistant or plastic-reinforced drapes are used for high-fluid cases. Answer: B
13. What is the first priority when an "Active Fire" is identified on the patient
during surgery?
A) Call for help
B) Remove the burning materials from the patient.
C) Aim the fire extinguisher at the patient
D) Turn off the oxygen
The immediate goal is to limit the burn injury to the patient. Stop the flow of breathing
gases (O2) and remove the drapes/burning material simultaneously. Answer: B
14. A "Bowie-Dick" test is used in which type of sterilizer to check for air
removal?
A) Gravity displacement
