AAMI COMPREHENSIVE REVIEW - SCIENCE EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027
Section One: Questions 1–100
Question 1
Which of the following organisms is most resistant to the sterilization process?
A. Fungi
B. Viruses
C. Bacterial endospores
D. Vegetative bacteria
🟢 C. Bacterial endospores
🔴 RATIONALE: Bacterial endospores possess thick protein coats and dehydrated states that make
them highly resistant to heat, chemicals, and radiation, requiring stringent sterilization parameters
compared to other microorganisms.
Question 2
What is the standard minimum temperature and time required for gravity-displacement steam sterilization
of wrapped instruments?
A. 121 degrees C (250 degrees F) for 30 minutes
B. 132 degrees C (270 degrees F) for 4 minutes
C. 135 degrees C (275 degrees F) for 3 minutes
D. 115 degrees C (240 degrees F) for 45 minutes
🟢 A. 121 degrees C (250 degrees F) for 30 minutes
🔴 RATIONALE: Standard parameters for gravity-displacement steam sterilization of wrapped goods
dictate a minimum exposure of 30 minutes at 121 degrees C to ensure adequate steam penetration.
Question 3
A technician notes a tear in the outer plastic wrap of a sterile instrument tray stored in the sterile storage
area. What is the appropriate next step?
,A. Tape the tear and leave the tray in storage
B. Consider the tray contaminated and reprocess it
C. Check the internal chemical indicator to see if it is still acceptable
D. Use the tray immediately before any dust can enter
🟢 B. Consider the tray contaminated and reprocess it
🔴 RATIONALE: Any breach in the physical integrity of a sterile barrier system compromises its sterility
maintenance, meaning the item must be considered unsterile and fully reprocessed.
Question 4
What type of medical device is classified under the Spaulding classification system as critical, requiring
sterilization before use?
A. Blood pressure cuffs
B. Rigid endoscopes entering sterile tissue
C. Laryngoscope blades
D. Stethoscopes
🟢 B. Rigid endoscopes entering sterile tissue
🔴 RATIONALE: Critical devices enter sterile tissue or the vascular system and carry a high risk of
infection if contaminated, necessitating complete sterilization.
Question 5
According to AAMI standards, what is the maximum recommended weight for a wrapped instrument
container or tray to ensure effective sterilization and ergonomic safety?
A. 15 pounds
B. 25 pounds
C. 35 pounds
D. 40 pounds
🟢 B. 25 pounds
,🔴 RATIONALE: AAMI ST79 recommends a maximum weight limit of 25 pounds for instrument sets to
ensure adequate steam penetration, drying, and to prevent staff strain during transport.
Question 6
Which of the following monitoring methods provides immediate visual confirmation that a specific
package has been exposed to the sterilization process, but does not prove sterility?
A. Biological indicator
B. External chemical indicator
C. Bowis-Dick test
D. Digital printout log
🟢 B. External chemical indicator
🔴 RATIONALE: External chemical indicators (Type 1) change color rapidly to indicate that a specific
package went through the cycle, differentiating processed from unprocessed items, but they do not
measure sterility metrics.
Question 7
When loading a steam sterilizer, how should textile packs be placed on the sterilizer rack?
A. Flat on their sides, tightly compressed
B. Vertically on edge, perpendicular to the shelf
C. Stacked horizontally on top of metal trays
D. Angled downward at a 90-degree slope
🟢 B. Vertically on edge, perpendicular to the shelf
🔴 RATIONALE: Placing textile packs vertically on edge allows the air to flow downward out of the pack
and steam to penetrate evenly without trapping air pockets.
Question 8
What is the function of a Bowie-Dick test in a dynamic-air-removal steam sterilizer?
A. To verify that all bacterial endospores have been killed
B. To measure the temperature inside individual instrument packs
, C. To detect air leaks and inadequate air removal from the chamber
D. To calibrate the pressure gauges of the autoclave jacket
🟢 C. To detect air leaks and inadequate air removal from the chamber
🔴 RATIONALE: The Bowie-Dick test evaluates the efficiency of air removal and steam penetration by
revealing residual air pockets that would impede sterilization in pre-vacuum cycles.
Question 9
Which process-challenging device (PCD) contains Geobacillus stearothermophilus spores and is used to
monitor steam sterilization cycles?
A. Chemical indicator strip
B. Biological indicator
C. Mechanical sensor log
D. Ultrasonic transducer
🟢 B. Biological indicator
🔴 RATIONALE: Biological indicators use the highly resistant non-pathogenic spore Geobacillus
stearothermophilus to demonstrate whether the sterilizer conditions were lethal enough to kill microbial
life.
Question 10
If a sterilization cycle fails its biological indicator test, what action must the department take regarding
items processed in that load and subsequent loads?
A. Document the failure and release items if chemical indicators passed
B. Recall all items processed since the last negative biological indicator
C. Reprocess only the items that were positioned near the back drain
D. Retest the biological indicator and use the items if the second test passes
🟢 B. Recall all items processed since the last negative biological indicator
🔴 RATIONALE: A biological indicator failure implies the load was not sterilized successfully, requiring an
immediate recall of all items back to the last known negative biological test to ensure patient safety.
(VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A |LATEST EXAM UPDATE 2026/2027
Section One: Questions 1–100
Question 1
Which of the following organisms is most resistant to the sterilization process?
A. Fungi
B. Viruses
C. Bacterial endospores
D. Vegetative bacteria
🟢 C. Bacterial endospores
🔴 RATIONALE: Bacterial endospores possess thick protein coats and dehydrated states that make
them highly resistant to heat, chemicals, and radiation, requiring stringent sterilization parameters
compared to other microorganisms.
Question 2
What is the standard minimum temperature and time required for gravity-displacement steam sterilization
of wrapped instruments?
A. 121 degrees C (250 degrees F) for 30 minutes
B. 132 degrees C (270 degrees F) for 4 minutes
C. 135 degrees C (275 degrees F) for 3 minutes
D. 115 degrees C (240 degrees F) for 45 minutes
🟢 A. 121 degrees C (250 degrees F) for 30 minutes
🔴 RATIONALE: Standard parameters for gravity-displacement steam sterilization of wrapped goods
dictate a minimum exposure of 30 minutes at 121 degrees C to ensure adequate steam penetration.
Question 3
A technician notes a tear in the outer plastic wrap of a sterile instrument tray stored in the sterile storage
area. What is the appropriate next step?
,A. Tape the tear and leave the tray in storage
B. Consider the tray contaminated and reprocess it
C. Check the internal chemical indicator to see if it is still acceptable
D. Use the tray immediately before any dust can enter
🟢 B. Consider the tray contaminated and reprocess it
🔴 RATIONALE: Any breach in the physical integrity of a sterile barrier system compromises its sterility
maintenance, meaning the item must be considered unsterile and fully reprocessed.
Question 4
What type of medical device is classified under the Spaulding classification system as critical, requiring
sterilization before use?
A. Blood pressure cuffs
B. Rigid endoscopes entering sterile tissue
C. Laryngoscope blades
D. Stethoscopes
🟢 B. Rigid endoscopes entering sterile tissue
🔴 RATIONALE: Critical devices enter sterile tissue or the vascular system and carry a high risk of
infection if contaminated, necessitating complete sterilization.
Question 5
According to AAMI standards, what is the maximum recommended weight for a wrapped instrument
container or tray to ensure effective sterilization and ergonomic safety?
A. 15 pounds
B. 25 pounds
C. 35 pounds
D. 40 pounds
🟢 B. 25 pounds
,🔴 RATIONALE: AAMI ST79 recommends a maximum weight limit of 25 pounds for instrument sets to
ensure adequate steam penetration, drying, and to prevent staff strain during transport.
Question 6
Which of the following monitoring methods provides immediate visual confirmation that a specific
package has been exposed to the sterilization process, but does not prove sterility?
A. Biological indicator
B. External chemical indicator
C. Bowis-Dick test
D. Digital printout log
🟢 B. External chemical indicator
🔴 RATIONALE: External chemical indicators (Type 1) change color rapidly to indicate that a specific
package went through the cycle, differentiating processed from unprocessed items, but they do not
measure sterility metrics.
Question 7
When loading a steam sterilizer, how should textile packs be placed on the sterilizer rack?
A. Flat on their sides, tightly compressed
B. Vertically on edge, perpendicular to the shelf
C. Stacked horizontally on top of metal trays
D. Angled downward at a 90-degree slope
🟢 B. Vertically on edge, perpendicular to the shelf
🔴 RATIONALE: Placing textile packs vertically on edge allows the air to flow downward out of the pack
and steam to penetrate evenly without trapping air pockets.
Question 8
What is the function of a Bowie-Dick test in a dynamic-air-removal steam sterilizer?
A. To verify that all bacterial endospores have been killed
B. To measure the temperature inside individual instrument packs
, C. To detect air leaks and inadequate air removal from the chamber
D. To calibrate the pressure gauges of the autoclave jacket
🟢 C. To detect air leaks and inadequate air removal from the chamber
🔴 RATIONALE: The Bowie-Dick test evaluates the efficiency of air removal and steam penetration by
revealing residual air pockets that would impede sterilization in pre-vacuum cycles.
Question 9
Which process-challenging device (PCD) contains Geobacillus stearothermophilus spores and is used to
monitor steam sterilization cycles?
A. Chemical indicator strip
B. Biological indicator
C. Mechanical sensor log
D. Ultrasonic transducer
🟢 B. Biological indicator
🔴 RATIONALE: Biological indicators use the highly resistant non-pathogenic spore Geobacillus
stearothermophilus to demonstrate whether the sterilizer conditions were lethal enough to kill microbial
life.
Question 10
If a sterilization cycle fails its biological indicator test, what action must the department take regarding
items processed in that load and subsequent loads?
A. Document the failure and release items if chemical indicators passed
B. Recall all items processed since the last negative biological indicator
C. Reprocess only the items that were positioned near the back drain
D. Retest the biological indicator and use the items if the second test passes
🟢 B. Recall all items processed since the last negative biological indicator
🔴 RATIONALE: A biological indicator failure implies the load was not sterilized successfully, requiring an
immediate recall of all items back to the last known negative biological test to ensure patient safety.
