Which device is used to regulate oxygen concentration by attaching color-coded adapters?

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

Answer: (D)

The Venturi device is designed to deliver a precise oxygen concentration by using color-coded adapters. It works by forcing oxygen through a jet and entraining ambient air through a side port; the amount of entrained air depends on the adapter size, which is color-coded to match a specific FiO2. Selecting the correct adapter provides a known, stable oxygen concentration, making it ideal when exact titration is needed for the patient.

Other devices don’t regulate FiO2 with color adapters. A simple facemask and a nasal cannula deliver more variable oxygen levels that depend on fit and flow, not a fixed color-coded setting. A bag-valve mask can deliver high FiO2 but is manual and not set by adapters for precise concentrations.