CST Surgical Asepsis & Sterilization 2

Question 1

Which sterilization method is most appropriate for heat-sensitive fiber optic cables?

Accepted Answer

Ethylene oxide (EtO) gas

Answer

Ethylene oxide gas sterilization is used for heat-sensitive items like fiber optic cables because it operates at low temperatures.

Question 2

What is the minimum exposure time for gravity displacement steam sterilization of wrapped instruments at 250°F (121°C)?

Accepted Answer

30 minutes

Answer

Gravity displacement autoclaves require 30 minutes at 250°F (121°C) for wrapped instrument packs.

Question 3

A scrub technician notices a package has a torn wrapper before opening. The correct action is to:

Accepted Answer

Re-wrap and re-sterilize the package

Answer

A compromised package wrapper indicates loss of sterility; the item must be re-wrapped and re-sterilized.

Question 4

Which of the following is NOT a parameter monitored by a Bowie-Dick test?

Accepted Answer

Sterilant concentration in EtO cycles

Answer

The Bowie-Dick test is specific to prevacuum steam sterilizers and evaluates air removal and steam penetration, not EtO concentration.

Question 5

When setting up a sterile field, items should be placed on the sterile drape at what distance from the edge?

Accepted Answer

At least 2 inches (5 cm)

Answer

The outer 1-inch (2.5 cm) border of a sterile drape is considered non-sterile; items must be kept at least 1 inch from the edge — some sources cite 2 inches for safety.

(CST) Certified Surgery Technician Practice Test

(CST) Certified Surgery Technician Practice Test

CST Surgical Asepsis & Sterilization 2