What is one characteristic of a non-rebreather mask?

A non-rebreather mask is designed to provide a high concentration of oxygen to patients who are experiencing severe hypoxemia. One key characteristic of this mask is its ability to deliver nearly 100% oxygen. It does this through a combination of a high-flow oxygen source and a one-way valve system that prevents room air from entering the mask, allowing the patient to inhale an oxygen-rich mixture directly from the bag attached to the mask.

This setup is particularly beneficial in emergency situations where rapid and effective oxygenation is critical, as seen in conditions like carbon monoxide poisoning or severe respiratory distress. The high flow rate associated with the use of a non-rebreather mask is essential for maintaining the reservoir bag's inflation and ensuring that the patient receives the maximum possible concentration of oxygen.

Other options do not accurately describe the characteristics of a non-rebreather mask. For instance, it does not deliver low oxygen concentrations or operate effectively at a flow rate of less than 6 L/min. In fact, flow rates are typically set between 10 to 15 L/min to ensure adequate oxygen delivery and function.