IAHCSMM (CRCST) CERTIFICATION
EXAM PREP 2026 QUESTIONS AND
ANSWERS
1. Which of the following organisms is most resistant to the sterilization process?
A. Prions
B. Vegetative bacteria
C. Fungi
D. Enveloped viruses
Answer: A
Conceptual Explanation: Prions are abnormal, pathogenic agents that are transmissible
and able to induce abnormal folding of specific normal cellular proteins. They are the most
resistant to standard sterilization methods.
2. According to AAMI standards, the maximum weight of a containerized instrument set
should not exceed:
A. 15 pounds
B. 25 pounds
,C. 20 pounds
D. 35 pounds
Answer: B
Conceptual Explanation: ANSI/AAMI ST79 recommends that the weight of an instrument
set, including the container, should not exceed 25 pounds to ensure ergonomic safety and
proper sterilization.
3. The process by which all forms of microbial life, including spores, are destroyed is known
as:
A. Disinfection
B. Sanitization
C. Decontamination
D. Sterilization
Answer: D
Conceptual Explanation: Sterilization is defined as the validated process used to render a
product free from all forms of viable microorganisms, including bacterial spores.
4. In the decontamination area, the recommended air exchange rate per hour is:
A. 5
B. 15
C. 10
, D. 20
Answer: C
Conceptual Explanation: ANSI/AAMI guidelines state that the decontamination area
should have a minimum of 10 air exchanges per hour to minimize the risk of airborne
contamination.
5. Which part of a surgical instrument is the weakest and most prone to breakage?
A. Shanks
B. Ratchet
C. Box lock
D. Jaws
Answer: C
Conceptual Explanation: The box lock is the hinge point of many surgical instruments and
is considered the weakest part because it is difficult to clean and subject to high stress.
6. The Bowie-Dick test is used to detect:
A. Biological contamination
B. Inadequate temperature
C. Air leaks in dynamic air removal sterilizers
D. Ethylene oxide residuals
EXAM PREP 2026 QUESTIONS AND
ANSWERS
1. Which of the following organisms is most resistant to the sterilization process?
A. Prions
B. Vegetative bacteria
C. Fungi
D. Enveloped viruses
Answer: A
Conceptual Explanation: Prions are abnormal, pathogenic agents that are transmissible
and able to induce abnormal folding of specific normal cellular proteins. They are the most
resistant to standard sterilization methods.
2. According to AAMI standards, the maximum weight of a containerized instrument set
should not exceed:
A. 15 pounds
B. 25 pounds
,C. 20 pounds
D. 35 pounds
Answer: B
Conceptual Explanation: ANSI/AAMI ST79 recommends that the weight of an instrument
set, including the container, should not exceed 25 pounds to ensure ergonomic safety and
proper sterilization.
3. The process by which all forms of microbial life, including spores, are destroyed is known
as:
A. Disinfection
B. Sanitization
C. Decontamination
D. Sterilization
Answer: D
Conceptual Explanation: Sterilization is defined as the validated process used to render a
product free from all forms of viable microorganisms, including bacterial spores.
4. In the decontamination area, the recommended air exchange rate per hour is:
A. 5
B. 15
C. 10
, D. 20
Answer: C
Conceptual Explanation: ANSI/AAMI guidelines state that the decontamination area
should have a minimum of 10 air exchanges per hour to minimize the risk of airborne
contamination.
5. Which part of a surgical instrument is the weakest and most prone to breakage?
A. Shanks
B. Ratchet
C. Box lock
D. Jaws
Answer: C
Conceptual Explanation: The box lock is the hinge point of many surgical instruments and
is considered the weakest part because it is difficult to clean and subject to high stress.
6. The Bowie-Dick test is used to detect:
A. Biological contamination
B. Inadequate temperature
C. Air leaks in dynamic air removal sterilizers
D. Ethylene oxide residuals
