What does a pulse oximeter measure?

A pulse oximeter is a non-invasive device used primarily to measure the oxygen saturation of a person's blood. It works by using light technology to evaluate how much oxygen is being carried by hemoglobin in the red blood cells. This measurement is crucial, especially in medical settings, as it provides immediate information about a patient’s respiratory status and the efficiency of oxygen delivery to the tissues.

Understanding the significance of oxygen saturation is important because low levels may indicate respiratory issues or other health concerns that require immediate attention. Keeping track of oxygen saturation helps healthcare providers make informed decisions about patient care, particularly in emergency situations or for patients with conditions affecting lung function.

The other options focus on different physiological parameters that a pulse oximeter does not assess. For instance, blood pressure levels, respiratory rate, and body temperature each require specific tools or methods—such as sphygmomanometers for blood pressure, manual counting or respiratory monitors for respiratory rate, and thermometers for body temperature—to provide accurate readings.