What percentage of oxygen does a simple face mask typically deliver?

A simple face mask typically delivers between 35-55% oxygen concentration. This range is due to the mask's design, which provides a direct flow of oxygen from a reservoir into the mask, mixing with ambient air. The result is an increased oxygen percentage delivered to the patient compared to room air while still allowing for some dilution from the patient's exhaled air and outside air.

This delivery method is suitable for patients who require a moderate level of oxygen therapy, such as those experiencing respiratory distress or other conditions that impede normal gas exchange. The mask's capacity to deliver oxygen effectively is also influenced by factors such as the flow rate of oxygen and the patient's breathing pattern. The flow rate typically recommended for a simple face mask is around 5-10 liters per minute, which helps to achieve the approximate percentage of oxygen stated.

In scenarios where a higher concentration of oxygen is needed, other devices like a non-rebreather mask would be used, which can deliver oxygen concentrations closer to 60-100%.