ADC Practice Question — Chemical Indicators

What constitutes a pass result?

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.

Emily, the dental assistant at Dr Park's practice, arrives at 7:30 AM to prepare the reprocessing area. The practice uses a Type B pre-vacuum steam steriliser. She needs to perform the required daily tests before processing the first load of instruments for the day. After running the Bowie-Dick test, Emily examines the indicator sheet. What constitutes a pass result?

A. Any visible colour change on the indicator, even if partial
B. A uniform colour change with no residual original colour remaining
C. At least 80% colour change across the indicator surface
D. Colour change in the centre of the indicator only

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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 exposure conditions, with no residual original colour remaining. Results are recorded as pass/fail. Partial colour change or non-uniform patterns indicate air removal failure and constitute a fail. (ICG p.50)

Source: ICG Section D: Bowie-Dick Test

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

Exam preparation FAQ

Should I memorise guidelines word-for-word for Chemical Indicators?

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

How are Chemical Indicators questions structured in the ADC written exam?

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

Every answer, traced to the source.

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What constitutes a pass result?

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