What is the typical oxygen concentration delivered by a nasal cannula?

When administering supplemental oxygen via a nasal cannula, the typical oxygen concentration delivered ranges from 24% to 36%. This range is based on the flow rate of oxygen provided through the cannula. At flow rates of about 1 to 6 liters per minute, patients generally receive approximately 24% to 36% oxygen. This is considered an appropriate level for patients who require mild to moderate oxygen support.

The reason why this range is the most accurate is that as the flow rate increases, the percentage of oxygen delivered also rises, typically around 4% for each additional liter of oxygen. As a result, the 24% to 36% range accurately reflects the expected delivery when using a nasal cannula in clinical practice. This understanding is crucial for health professionals when assessing and providing appropriate respiratory support to patients.