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High-Level Disinfection Processes Questions and Answers Flashcards

6 cards from real CER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the minimum effective concentration (MEC) for glutaraldehyde used in high-level disinfection?

    Answer: 1.5% (most products require ≥1.5% per EPA label)

    The MEC for glutaraldehyde HLD is typically 1.5% (product-specific; always confirm with the manufacturer's label and EPA registration).

  2. What is the contact time for ortho-phthalaldehyde (OPA) at room temperature for high-level disinfection?

    Answer: 12 minutes at ≥20°C (per FDA clearance and manufacturer IFU)

    OPA (e.g., Cidex OPA) requires a minimum 12-minute contact time at ≥20°C for HLD per its FDA-cleared label.

  3. Why must endoscopes be thoroughly rinsed after HLD with glutaraldehyde or OPA?

    Answer: To remove chemical residues that can cause patient injury such as colitis or mucosal irritation

    Residual HLD chemicals can cause chemical colitis, mucosal irritation, or allergic reactions in patients if not completely rinsed from channels.

  4. Which professional organization publishes guidelines specifically for endoscope reprocessing for GI endoscopy settings?

    Answer: SGNA (Society of Gastroenterology Nurses and Associates)

    SGNA publishes the primary practice guidelines for endoscope reprocessing specifically for GI endoscopy settings.

  5. What is the maximum reuse life of most glutaraldehyde solutions used for HLD?

    Answer: 14–28 days per manufacturer IFU, provided concentration remains above MEC on each test

    Glutaraldehyde has a maximum reuse life (typically 14–28 days depending on product) but must be discarded sooner if concentration falls below MEC.

  6. What is the difference between 'disinfection' and 'sterilization' in the context of endoscope reprocessing?

    Answer: Disinfection reduces most microorganisms but does not reliably eliminate all spores; sterilization destroys or inactivates all forms of microbial life including spores

    Disinfection (including HLD) eliminates vegetative bacteria, fungi, mycobacteria, and viruses but may not reliably kill all bacterial spores; sterilization achieves complete microbial elimination.