Care Manager Certification Practice Exam

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What type of oxygen concentration does a nasal cannula deliver to the patient?

  1. Constant high concentration of oxygen

  2. High concentration of oxygen

  3. Low concentration of oxygen

  4. Intermittent oxygen supply

The correct answer is: Low concentration of oxygen

A nasal cannula delivers low concentrations of oxygen, typically between 24% and 40%, depending on the flow rate set on the oxygen delivery system. This method allows patients to receive supplemental oxygen while still breathing room air, resulting in a lower overall concentration of oxygen in the inspired air. The nasal cannula is particularly useful for patients who require mild oxygen therapy, as it is comfortable and allows for easy communication and movement. Higher concentrations, such as those provided by other delivery systems like non-rebreather masks or ventilators, are not achieved with a nasal cannula due to the design and the way it mixes ambient air with the provided oxygen.

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