The oxygen saturation of normal arterial blood is 98%, and that of venous blood is 75%.
Extended data:
Measurement method
Many clinical diseases will cause insufficient oxygen supply, which directly affects the normal metabolism of cells and seriously threatens people's lives. Therefore, real-time monitoring of arterial oxygen concentration is very important in clinical rescue.
The traditional method of measuring blood oxygen saturation is to take blood from human body first, then make electrochemical analysis with blood gas analyzer, and calculate the bleeding oxygen saturation by measuring the bleeding oxygen partial pressure PO2. This method is troublesome and cannot be continuously monitored.
Finger-sleeve photoelectric sensor is adopted. When measuring, we only need to put the sensor on a person's finger, use the finger as a transparent container for containing hemoglobin, and use red light with wavelength of 660 nm and near-infrared light with wavelength of 940 nm as incident light sources to measure the light transmission intensity through the tissue bed and calculate the hemoglobin concentration and oxygen saturation. The instrument can display the blood oxygen saturation of human body, and provides a continuous noninvasive blood oxygen measuring instrument for clinic. .
References:
Baidu encyclopedia-blood oxygen saturation