ADC Practice Question — Cleaning Methods for RMDs

What does the failed Bowie-Dick type test result (non-uniform colour change with residual original colour) most likely indicate?

Infection control in the ADC exam tests decision-making around exposure incidents, instrument classification, and decontamination protocols. This exam-level vignette tests your ability to work through clinical details and arrive at the correct management.

Dr Michael Chen's practice has a steam steriliser that processes both packaged and non-packaged reusable medical devices (RMDs). The dental nurse Jake is reviewing the steriliser capabilities and conducting quality control testing. During today's Bowie-Dick type test, the chemical indicator showed non-uniform colour change with some residual original colour remaining. What does the failed Bowie-Dick type test result (non-uniform colour change with residual original colour) most likely indicate?

A. Temperature too high
B. Problems with air removal resulting in insufficient steam penetration
C. Excessive moisture in chamber
D. Indicator strip expired

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Sources cited

Therapeutic Guidelines v4 Odell's 3rd & 4th Ed IADT 2020 Code of Conduct CMS (Evans) Infection Control + more

Show the answer and cited explanation

Correct answer: B

A 'fail' result could be due to problems with air removal (including failure of the vacuum pump or vacuum system) resulting in air and other gases remaining in the chamber, and causing insufficient steam penetration onto the indicator surface (ICG p.49)

Source: ICG Section 9: Steam steriliser performance tests

Remy's study tip — The differentiator is usually the Spaulding classification level or the step order in a protocol.

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Should I memorise guidelines word-for-word for Cleaning Methods for RMDs?

Focus on decision points — when the guideline says X vs Y. The exam tests application, not recitation.

How are Cleaning Methods for RMDs questions structured in the ADC written exam?

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What does the failed Bowie-Dick type test result (non-uniform colour change with residual original colour) most likely indicate?

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