CER High-Level Disinfection Processes Questions and Answers 2

Question 1

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

Accepted Answer

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

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

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

Answer

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

Question 4

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

Accepted Answer

SGNA (Society of Gastroenterology Nurses and Associates)

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

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