CRCST CRCST Microbiology and Infection Control

Question 1

Which type of microorganism is the MOST resistant to standard sterilization methods?

Accepted Answer

Bacterial spores

Answer

Bacterial spores (e.g., Clostridium and Bacillus species) are the most resistant microorganisms and are used as biological indicators to validate sterilization.

Question 2

What is the Spaulding Classification used for in central service?

Accepted Answer

Categorizing medical devices by the level of disinfection or sterilization required

Answer

The Spaulding Classification system categorizes devices as critical, semi-critical, or non-critical to guide the appropriate level of reprocessing required.

Question 3

Which Spaulding category applies to instruments that enter sterile tissue or the vascular system?

Accepted Answer

Critical

Answer

Critical items contact sterile body tissues or the vascular system and must be sterilized, as any microbial contamination poses a high infection risk.

Question 4

What is the correct term for killing all microorganisms including bacterial spores on inanimate objects?

Accepted Answer

Sterilization

Answer

Sterilization is the complete destruction of all forms of microbial life, including bacterial spores, on inanimate objects.

Question 5

Which organism is used as the biological indicator (BI) for steam sterilization?

Accepted Answer

Geobacillus stearothermophilus

Answer

Geobacillus stearothermophilus spores are the standard biological indicator for steam (autoclave) sterilization because of their high heat resistance.

(CRCST) Certified Registered Central Service Technician Exam Practice Test

(CRCST) Certified Registered Central Service Technician Exam Practice Test

CRCST CRCST Microbiology and Infection Control