Which device uses color-coded adapters to regulate FiO2?

• A. Nasal Cannula
• B. Venturi Device
• C. Simple Facemask
• D. Bag-Valve Mask

Answer: (B)

The device that uses color-coded adapters to regulate FiO2 delivers a precise, fixed oxygen concentration by using different color inserts that correspond to specific FiO2 values. These adapters work with the Venturi principle: oxygen flows through a narrow jet, entrains ambient air in a controlled way, and the color-coded insert determines exactly how much air mixes in, giving a set FiO2 regardless of the patient’s breathing pattern. This precision is what sets the Venturi mask apart from other devices.

Nasal cannulas deliver oxygen with variable FiO2 that depends on flow and the patient’s inspiratory effort, and simple facemasks provide a broader, less predictable range of FiO2. Bag-valve masks can deliver high FiO2 when connected to a source of oxygen, but the amount of oxygen delivered isn’t fixed by a color-coded adapter.