ADC Practice Question — Biological Indicators & Validation

What is the minimum class of chemical indicator that must be placed INSIDE every package until validation is complete?

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. The practice has just received a brand new steriliser that has not yet undergone validation with biological indicators. What is the minimum class of chemical indicator that must be placed INSIDE every package until validation is complete?

A. Class 1
B. Class 2
C. Class 4
D. Class 6

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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: C

A Class 4 chemical indicator is the minimum that must be included inside every package when reprocessing conditions have not been verified by a full qualification process involving biological indicators. This applies when a brand new or loaned steriliser is used, when the printer has failed, or when new packaging material is used. (ICG p.56)

Source: ICG Section D: Chemical Indicators

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

Exam preparation FAQ

How should I prepare for Infection Control in the ADC exam?

Build competence across all topics. The exam tests application of guidelines to clinical scenarios, not memorisation.

How do I approach an unfamiliar Biological Indicators & Validation vignette?

Extract key clinical data from the stem before reading options. There are usually 3–4 critical variables that determine the correct answer.

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What is the minimum class of chemical indicator that must be placed INSIDE every package until validation is complete?

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