What is the normal oxygen concentration delivered via a non-rebreather mask?

The normal oxygen concentration delivered via a non-rebreather mask is typically around 15 liters per minute. This high flow rate is essential because a non-rebreather mask is designed to deliver a high concentration of oxygen to patients who are critically ill or in respiratory distress. The mask has a reservoir bag that allows for the storage of oxygen, providing a higher concentration to the patient with each breath. When properly fitted and used at the recommended flow rate, it can deliver up to approximately 90% oxygen concentration, making it highly effective for those who require significant respiratory support.

Using lower flow rates, such as 5, 10, or even higher than 15 liters per minute, would not ensure adequate oxygen delivery or saturation, making them insufficient for the urgent needs of patients in serious conditions requiring a non-rebreather mask.