For a person with moderate to severe hypoxia who is breathing adequately, which delivery device is proper?

The non-rebreather mask is the proper delivery device for a person experiencing moderate to severe hypoxia who is breathing adequately because it allows for the highest delivery of oxygen concentration. This type of mask is designed to deliver close to 100% oxygen, which is essential for improving oxygen levels in individuals with significant hypoxia.

The mask includes a one-way valve that prevents exhaled air from entering the oxygen reservoir bag, ensuring that the patient receives a concentrated flow of oxygen during inspiration. Additionally, when used at a flow rate of 12-15 liters per minute, the non-rebreather mask can effectively fill the reservoir bag, allowing for maximum oxygen delivery.

This is crucial in cases of moderate to severe hypoxia, as the body requires a rapid influx of oxygen to correct the deficiency. The other devices, while they can provide oxygen, do not deliver concentrations high enough for a patient in this condition.