NREMT Paramedic Practice

What is the typical oxygen concentration provided by a simple face mask?

1. 21-30%

2. 35-60%

3. 80-90%

4. 100%

The correct answer is: 35-60%

The typical oxygen concentration provided by a simple face mask is in the range of 35-60%. This is due to the design of the mask, which allows for the delivery of a higher concentration of oxygen compared to the ambient air, while still mixing ambient air with the supplied oxygen. When oxygen is delivered through a simple face mask, it can flow directly into the patient's airway, increasing their oxygen intake. In a clinical setting, this mask utilizes a reservoir to capture a certain amount of oxygen, which can help maintain a consistent oxygen flow. The variability in the concentration can be influenced by the patient's respiratory patterns, such as the rate and depth of breathing. This option is preferred when patients require supplemental oxygen without the need for more precise delivery methods, such as a non-rebreather mask or mechanical ventilation. The other options, while referring to oxygen concentration levels, do not align with what is typically delivered by a simple face mask. A simple face mask does not provide as high a concentration as 80-90% or 100%, which are achieved with specialized devices like non-rebreather masks or ventilators. An oxygen concentration of 21-30% is characteristic of ambient air rather than a supplemental oxygen delivery system.