In addition to heart rate, blood pressure, respiratory rate, and temperature, the nurse needs to assess a patients arterial oxygen saturation $\left(\mathrm{SaO}_{2}\right)$. What procedure will best accomplish this?

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Pulse oximetry is a noninvasive procedure in which a small sensor is positioned over a pulsating vascular bed. It can be used during transport and causes the patient no discomfort. An incentive spirometer is used to assist the patient with deep breathing after surgery. ABG measurement can measure $\mathrm{SaO} 2$, but this is an invasive procedure that can be painful. Some patients with asthma use peak flow meters to measure levels of expired air.

In Addition to Heart Rate, Blood Pressure, Respiratory Rate, and Temperature