What is the flow rate of oxygen delivered by a non-rebreather mask?

• A. 6-10 LPM
• B. 10-15 LPM
• C. 15 LPM
• D. 1-6 LPM

Answer: (C)

The flow rate of oxygen delivered by a non-rebreather mask is typically around 15 liters per minute (LPM). This high flow rate is necessary to ensure that the bag of the mask remains inflated and that adequate oxygen is being delivered to the patient. The non-rebreather mask is designed to provide a high concentration of oxygen, often estimated at around 90% or more, which is particularly important for patients experiencing respiratory distress or significant hypoxia.

The flow rate is critical because it allows for a sufficient volume of oxygen to be available in the reservoir bag, which the patient can inhale during each breath. If the flow rate were lower, the bag might not stay adequately inflated, reducing the effectiveness of the mask and potentially leading to exposure to ambient air, which could dilute the oxygen being delivered.

In contrast, lower flow rates would not provide the necessary oxygen concentration and could be inadequate for patients with significant respiratory needs. For example, a flow rate of 6-10 LPM or even 1-6 LPM may deliver insufficient oxygen and is typically associated with other oxygen delivery devices that aim for lesser concentrations. Therefore, the choice of 15 LPM aligns with the intended use and effectiveness of a non-rebreather mask in critical