Which device is used to measure the oxygen saturation level in the blood?

A pulse oximeter is a non-invasive device used to measure the oxygen saturation level in the blood. It works by using light absorption principles to assess how much oxygen is bound to hemoglobin in the blood. By placing a clip-like sensor on a thin part of the body, such as a finger or earlobe, the device can quickly provide readings of peripheral oxygen saturation (SpO2), typically expressed as a percentage. This information is crucial in medical settings to monitor respiratory function, evaluate lung conditions, and determine the need for supplemental oxygen.

In contrast, a sphygmomanometer measures blood pressure, while a capnometer is utilized to measure carbon dioxide levels in respiratory gases. A spirometer assesses lung function by measuring the volume and flow of air during inhalation and exhalation. Each of these devices has its own specific use in healthcare, but none of them provides the same information as a pulse oximeter regarding oxygen saturation.