What does the pulse oximeter measure?

A pulse oximeter is a non-invasive device specifically designed to measure the oxygen saturation level in a person's blood. It determines how much oxygen is being carried by hemoglobin in comparison to its total capacity, offering insight into a patient's respiratory status. A healthy range for oxygen saturation is typically between 95% and 100%. By monitoring oxygen saturation, healthcare providers can assess for conditions like hypoxemia, where the body or a region of the body is deprived of adequate oxygen supply.

While heart rate and blood pressure are essential vital signs, they are measured using different devices and methods. Blood pressure is typically monitored with a sphygmomanometer, and heart rate can be determined through a pulse check or other heart rate monitors. Body temperature, another vital sign, is assessed using thermometers. Therefore, the pulse oximeter's primary function revolves around gauging oxygen saturation, making it a crucial tool in both clinical and emergency settings.