In a salon, which surface is most likely noncritical?

• A. A mucous membrane contact surface.
• B. A chair armrest that touches intact skin.
• C. A sterile syringe.
• D. A surgical incision site.

Answer: (B)

Noncritical surfaces are those that only touch intact skin and don’t contact mucous membranes or penetrate sterile tissue. An armrest on a chair fits this because it touches only healthy skin and doesn’t come into contact with mucous membranes or open wounds. That lower risk surface is treated with routine cleaning and appropriate disinfection for noncritical items.

In contrast, a surface that would contact mucous membranes is semi-critical and requires higher-level disinfection. A sterile syringe is a critical item because it penetrates sterile body tissues, so it must be sterilized. A surgical incision site is also part of sterile body tissue and requires strict sterile technique.