Oxygen saturation or SpO2 is one of the five parameters when measuring the vitals of critically ill patients. Combined with pulse rate or PR, highly accurate SpO2 measurement helps to improve patient outcomes and reduce any delays in providing critical emergency care. Pulse oximeters can forewarn clinicians about hypoxemia, leading to faster treatment of serious hypoxemia and circumventing serious complications. About pulse oximetry Since its introduction in 1974 by Takuo Aoyagi in 1974, pulse oximetry has become the de facto standard for evaluating oxygen saturation. Pulse oximetry works by illuminating the skin and measuring changes in light absorption of oxygenated...