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IAHCSMM CRCST 8TH EDITION - CRCST Exam Prep Practice Exercise 1 Questions and Answers
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IAHCSMM CRCST 8TH EDITION - CRCST Exam Prep Practice Exercise 1 Questions and Answers
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IAHCSMM CRCST 8TH EDITION - CRCSTExam Prep Practice Exercise 1
Questions and Answers
Dynamic air removal: exposure time for any wrapped item at 275 degrees. - Answer -3
minutes
What is the correct percentage of relative humidity for steam sterilization? - Answer -
97%-100%
What are the 4 cycles of steam sterilization? - Answer -Conditioning, exposure, exhaust,
drying
Which low-temp sterilization method requires monitoring? - Answer -Ethylene oxide
How does ethylene oxide kill microbes? - Answer -By a process called alkylation.
How do ozone and hydrogen peroxide kill microbes? - Answer -By a process called
oxidation.
Discuss sterilization parameters for ethylene oxide (concentration, temp, humidity,
exposure time, aeration time) - Answer -Concentration: 450-1200 mg/l
Temp: 98-145 degrees F
Exposure time: 1-6 hours
Humidity: 40-80%
Aeration time: 8-12 hours at 122-140 degrees F
What is the microorganism of choice for ethylene oxide sterilization? - Answer -Bacillus
atrophaeus
What are the five phases of gas plasma sterilization? - Answer -Vacuum, injection,
diffusion, plasma, vent
Which materials are not recommended for use in hydrogen peroxide sterilization
method She? - Answer -Cellulose, muslin wraps
, What is the microorganism of choice for hydrogen peroxide gas plasma sterilization? -
Answer -Geobacillus stearothermophilus
Discuss hydrogen peroxide gas plasma sterilization parameters (time, temp,
concentration, vacuum level, plasma) - Answer -Time: 24-75 minutes
Temp: less than 131 degrees F
Concentration: 59-95%
Vacuum level: auto controlled
Plasma: auto controlled
What are the 4 cycles for vaporized hydrogen peroxide systems? - Answer -
Conditioning, leak test, sterilization, aeration
Discuss vaporized hydrogen peroxide sterilization parameters (temp, concentration,
time, other). - Answer -Temp: less than 122 degrees F
Concentration: 59%
Time: 28-55 minutes
Other: preset cycles
What is the microorganism of choice for VHP? - Answer -Geobacillus
stearothermophilus
Discuss ozone sterilization parameters (temp, concentration, humidity, time). - Answer -
Temp: 87.4-97 degrees F
Concentration: 59%
Humidity: 85-100%
Time: 4.5 hours
What is the microorganism of choice for OzOne sterilization? - Answer -Geobacillus
stearothermophilus
What materials cannot be processed in VHP or gas plasma sterilizers? - Answer -
Cellulose, linens, liquids, powders
What materials cannot be processed in an ozone sterilizer? - Answer -Rubber, latex,
textiles, copper, brass, bronze, zinc, nickel.
How many air exchanges are required in the decontamination area? - Answer -No less
that 10 per hour.
What are the parameters for relative humidity in the decontamination area? - Answer -
30-60%
What should the temperature range be in the decontamination are? - Answer -60-65
degrees F
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