Pulse oximetry

Pulse oximetry is a test that uses a device called a pulse oximeter. It is a quick and painless way to check blood oxygen levels, with no known risks. It is a non-invasive method that allows the percentage of oxygen saturation of haemoglobin in blood to be determined using photoelectric methods. This technique is performed by placing the pulse oximeter on a part of the body that is relatively translucent and has good blood flow, such as the fingers, toes, or earlobe. The pulse oximeter emits red and infrared wavelengths of light that pass sequentially from an emitter to a photodetector through the patient, and the measurement is obtained.