What percentage of oxygen is typically delivered by a partial rebreather mask?

A partial rebreather mask is designed to deliver a higher concentration of oxygen to a patient than a simple face mask. It typically provides an oxygen concentration of approximately 40 to 60 percent. This range is achieved by allowing a portion of the exhaled air to be rebreathed, which helps to increase the oxygen levels without using a bag as seen in a non-rebreather mask. The mask has a reservoir bag that collects the initial portion of exhaled air, which is rich in carbon dioxide and some oxygen, and this mix can be inhaled again. This mechanism works effectively for patients who require moderate supplemental oxygen.

In contrast, a simple face mask typically delivers lower concentrations of oxygen, ranging from about 24 to 44 percent, while a non-rebreather mask is used for situations where very high levels of oxygen (80 to 100 percent) are required. A nasal cannula generally provides a lower concentration, around 10 to 30 percent, which is not suitable for patients needing higher support. Therefore, the 40 to 60 percent range provided by a partial rebreather mask is appropriate for various medical situations where patients require increased oxygenation but do not need the maximum output given by a non-rebre