ADC Practice Question — Sterilisation & Disinfection Terminology

A Class 6 chemical indicator responds to which sterilisation process variables?

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.

A newly graduated dentist, Dr Tan, is reviewing the ICG before starting at a new practice. She encounters several key terms and definitions that form the foundation of IPC in dental practice. The practice manager quizzes her understanding of core concepts. A Class 6 chemical indicator responds to which sterilisation process variables?

A. Heat only
B. Heat and steam
C. Time, temperature, and steam with high precision (1°C, 5% time tolerance)
D. Time and temperature only, without steam detection

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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

Class 6 emulating indicators respond to time, temperature, and steam with high precision — 1°C temperature tolerance and 5% time tolerance. This contrasts with Class 4 (2°C, 25% time) and Class 5 (1°C, 15% time). Class 1 responds to heat only. (ICG p.7, 55)

Source: ICG Glossary / 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 Sterilisation & Disinfection Terminology 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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A Class 6 chemical indicator responds to which sterilisation process variables?

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