How much oxygen does a simple face mask deliver?

A simple face mask typically delivers oxygen at flow rates of 6 to 10 liters per minute (lpm). This flow rate allows a higher concentration of oxygen to be administered to the patient compared to lower delivery systems, such as nasal cannulas. The mask covers the nose and mouth, facilitating the inhalation of a mix of oxygen and room air. At 6 to 10 lpm, the mask can provide an approximate oxygen concentration of 40-60%, depending on the fit of the mask and the patient's respiratory pattern. This makes it suitable for patients who need supplemental oxygen but are not in severe respiratory distress, as it allows for adequate delivery without the need for more complex systems, such as non-rebreather masks or high-flow oxygen therapy.

The other flow ranges given in the options either do not accurately reflect the typical delivery capabilities of a simple face mask, or they pertain to different types of oxygen delivery devices. For instance, lower settings would correspond to nasal cannulas, which are less effective for higher oxygen demands.