Hospitals use the clip on the finger of something called oxygen saturation probe sensor, monitoring blood oxygen saturation, generally normal for 98% -100%, if less than 95% is abnormal. It should be said to be a respiratory-related indicators of a monitoring.
In the monitoring of physiological parameters, in addition to electrocardiography, blood pressure, etc., the human blood oxygen concentration that is the determination of oxygen saturation in the clinic also has a very important significance. In surgical operations or the monitoring of critically ill patients, to avoid the patient hypoxia, timely understanding of the oxygen content of the blood is very necessary.
Expanded information:
The concept of oxygen saturation and the principle of measurement:
O2 transport, O2 and hemoglobin mainly in the form of binding in the red blood cells, the amount of physical dissolution of a very small, per 100 ml of blood, hemoglobin combined with the largest amount of oxygen is called the oxygen capacity of the OCP, the amount of blood red and white the amount of oxygen combined with the actual amount of oxygen is called the oxygen content of the OCN. The oxygen saturation is the ratio of the two.
The range of SPO2 in general is 92% to 98%. The basic principle of in vivo measurement of oxygen saturation uses the photoelectric method. The arterial vasculature is usually constantly pulsating, and during systole and diastole, as blood flow increases or decreases, light is absorbed to varying degrees, and the ratio of light absorption during the systole and diastole phases is converted into the oxygen saturation measurement, the electronic principle of blood oxygen saturation measurement.
Baidu Encyclopedia-Blood Oxygen Saturation Probe