ADC Practice Question — Key IPC Terminology

What specific temperature and time parameters are used…

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 specific temperature and time parameters are used for the Bowie-Dick type test exposure conditions?

A. 121°C for 15 minutes
B. 134-135.5°C at 3.15 mins with a tolerance of 5 seconds
C. 132°C for 4 minutes
D. 138°C for 2 minutes

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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

The indicator sheet or strip must show a uniform colour change under the exposure conditions used (134–135.5°C at 3.15 mins with a tolerance of 5 seconds), with no residual original colour remaining (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.

Exam preparation FAQ

How are Key IPC Terminology questions structured in the ADC written exam?

ADC Key IPC Terminology questions present as clinical vignettes requiring management decisions. The correct answer is always traceable to a guideline source.

Should I memorise guidelines word-for-word for Key IPC Terminology?

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

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