SpO2 is an abbreviation for which physiological measure?

Prepare for the Certification in Clinical Sleep Health exam. Use flashcards and multiple-choice questions with hints and explanations. Ace your exam!

SpO2 represents the oxygen saturation level of hemoglobin in the blood, expressed as a percentage. The term stands for oxyhemoglobin saturation, meaning the proportion of hemoglobin molecules that are carrying oxygen. A pulse oximeter estimates this noninvasively by measuring how much red and infrared light is absorbed by blood in the fingertip (or earlobe) and uses the pulsatile arterial component to distinguish oxygenated from deoxygenated hemoglobin. Normal SpO2 typically ranges from about 95% to 100%, with lower values indicating potential hypoxemia. This measurement is not related to sleep-disordered breathing, medications like selective serotonin reuptake inhibitors, or a time constant.