The most important approach for the nurse to use when applying a nasal cannula is TO MEASURE OXYGEN SATURATION.
Measuring oxygen saturation gives data about a person's overall oxygenation. Oxygen saturation is measured with the help of a Pulse Oximeter. It is a small device that is clipped to the finger to measure oxygenation.
Oxygen saturation refers to the fraction of oxygen-saturated hemoglobin as compared to the total hemoglobin in the body.