Pulse oximetry is a non-invasive medical technique used to measure the oxygen saturation level in arterial blood. It is also commonly referred to as pulse ox or SpO2 measurement. Synonyms for pulse oximetry include oxygen saturation monitoring, arterial oxygen saturation monitoring, pulse oximeter monitoring, and oxygen saturation measurement. These terms essentially refer to the process of using a pulse oximeter device to measure the amount of oxygen in the blood. This technique is widely used in medical practice to monitor patients' oxygen levels, particularly those with respiratory conditions or who are under anesthesia during surgery. With the help of pulse oximetry, healthcare practitioners can monitor the effectiveness of treatments such as oxygen therapy and adjust them accordingly.