Certified Surgical Technologist Aseptic Technique and Sterilization Questions and Answers

Question 1

A surgical technologist is setting up for a procedure and notices a wrapped instrument tray has a small, dry water stain on the outer wrap. The integrity of the packaging is not compromised, and the external chemical indicator has changed appropriately. What is the most appropriate action for the technologist to take?

Accepted Answer

Consider the tray contaminated and remove it from the sterile field.

Answer

Any moisture that penetrates a sterile barrier, even if it has since dried, creates a pathway for microorganisms to enter. This is known as strike-through contamination. The presence of a water stain indicates a previous event that compromised the package's sterility, making the contents unsterile and unsafe for use.

Question 2

Which of the following provides the most definitive evidence that a sterilization cycle was effective?

Accepted Answer

A biological indicator containing Geobacillus stearothermophilus spores shows no growth after incubation.

Answer

A biological indicator (BI) is the gold standard for verifying sterilization efficacy. It directly challenges the sterilizer's ability to kill the most resistant microorganisms, such as Geobacillus stearothermophilus spores for steam sterilizers. A negative result (no growth) provides the highest level of assurance that the sterilization process was lethal. Chemical indicators and physical readouts only confirm that the items were exposed to certain conditions, not that sterility was achieved.

Question 3

During a surgical procedure, a circulating nurse reaches over the sterile back table to retrieve an item. Which principle of aseptic technique has been violated?

Accepted Answer

Non-sterile individuals should not reach over a sterile field.

Answer

A fundamental principle of aseptic technique is that non-sterile persons must never reach over a sterile field. Doing so can cause shedding of microbes, dust, or other particles from the non-sterile person onto the sterile surface, leading to contamination. Non-sterile personnel should always maintain a safe distance from sterile fields.

Question 4

The modern concept of 'event-related sterility' dictates that an item remains sterile until what occurs?

Accepted Answer

An event compromises the integrity of the package.

Answer

Event-related sterility (ERS) is the current standard, replacing time-related expiration dates. It posits that a product remains sterile until an 'event' occurs that compromises the package barrier. Such events include tears, punctures, moisture penetration, or broken seals, regardless of how long the item has been sterilized.

Question 5

A surgical technologist is preparing for a case involving heat-sensitive instruments, such as flexible endoscopes. Which sterilization method would be most appropriate for these items?

Accepted Answer

Ethylene Oxide (ETO) gas

Answer

Ethylene Oxide (ETO) is a low-temperature sterilization method suitable for items that are sensitive to heat and moisture, such as flexible scopes, plastics, and delicate instruments. Steam autoclaving and dry heat use high temperatures that would damage such items, while ionizing radiation is typically used for industrial sterilization of pre-packaged goods.

Certified Surgical Technologist Practice Test

Certified Surgical Technologist Practice Test

Certified Surgical Technologist Aseptic Technique and Sterilization Questions and Answers