ADC Practice Question — Cleaning Methods for RMDs

What are the AS 5369 requirements for final rinse water quality in RMD reprocessing?

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 new reprocessing room is being designed for Dr Park's expanding practice. The architect asks about ventilation requirements, sink layout, and water quality specifications. Meanwhile, the dental assistants are trained on correct pre-cleaning and cleaning protocols. What are the AS 5369 requirements for final rinse water quality in RMD reprocessing?

A. Tap water is acceptable for all rinse stages
B. Distilled water only
C. pH 5.5-8.0, conductivity ≤30 µS/cm, hardness ≤10 mg/L, bacteria ≤100/100mL, endotoxins ≤0.25 EU/mL
D. Any water with bacterial count below 200 CFU/mL

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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

For final rinse water, AS 5369 requires: pH 5.5-8.0, conductivity ≤30 microSiemens/cm, hardness ≤10 mg/L, viable bacteria ≤100 per 100 mL, and endotoxins ≤0.25 EU/mL. Water for initial cleaning must have hardness below 150 mg/L and chloride ions below 120 mg/L. (ICG pp.41-42)

Source: ICG Section D: Water Quality

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Exam preparation FAQ

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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