CRCST Instrument Processing 2

Question 1

Which enzyme is most commonly used in enzymatic detergents to break down protein-based bioburden on surgical instruments?

Accepted Answer

Protease

Answer

Protease enzymes specifically break down proteins, which constitute the majority of blood and tissue soils on surgical instruments.

Question 2

During mechanical decontamination in a washer-disinfector, what temperature range is typically used in the thermal disinfection cycle to achieve pasteurization?

Accepted Answer

71–80°C (160–176°F)

Answer

Thermal disinfection in washer-disinfectors typically uses 71–80°C for a specified time to achieve pasteurization-level disinfection.

Question 3

A hinged instrument is opened before sterilization primarily to:

Accepted Answer

Allow steam or sterilant contact on all surfaces including box locks

Answer

Opening hinged instruments ensures sterilant reaches the box lock area, which is a critical contact point that cannot be penetrated when the instrument is closed.

Question 4

Which of the following best describes 'critical' items in the Spaulding Classification System?

Accepted Answer

Items that enter sterile tissue or the vascular system and require sterilization

Answer

Critical items enter sterile body tissue or the vascular system and pose the highest infection risk, requiring sterilization before use.

Question 5

What is the purpose of a biological indicator (BI) in sterilization monitoring?

Accepted Answer

To demonstrate that viable microorganisms were killed during the sterilization process

Answer

Biological indicators contain highly resistant spores; their destruction after processing confirms the sterilization process was effective at killing microorganisms.

(CRCST) Certified Registered Central Service Technician Exam Practice Test

(CRCST) Certified Registered Central Service Technician Exam Practice Test

CRCST Instrument Processing 2