Which term refers to a mask that delivers high concentrations of oxygen with a non-rebreathing valve?

• A. Nebulizer
• B. Nasal Cannula
• C. Room Air
• D. Non-Rebreather

Answer: (D)

When you want to deliver the highest possible concentration of oxygen through a mask, you choose a device that includes a reservoir and one-way valves to prevent rebreathing. A non-rebreather mask does exactly this: it has a reservoir bag that fills with oxygen, and one-way valves on the exhalation ports so the exhaled air doesn’t go back into the bag. With adequate flow (typically 10–15 L/min) and a good seal, the patient inhales mostly oxygen from the reservoir, producing the highest FiO2 available from standard mask devices—often near 100% in ideal conditions.

In contrast, a nebulizer is meant for delivering inhaled medications and does not guarantee high oxygen concentration. A nasal cannula delivers oxygen at a relatively modest FiO2, usually around 24–44%, and lacks a reservoir to maximize inspired oxygen. Room air refers to ambient atmospheric oxygen, not a delivery device.

So the non-rebreather mask is the best choice for delivering high concentrations of oxygen with a non-rebreathing valve.