How to measure (blood) oxygen saturation(level)?
Blood oxygen saturation measurement method:
1. The traditional method of measuring blood oxygen saturation is to first collect blood from the human body, and then perform electrochemical analysis using a blood gas analyzer to measure the hemorrhage oxygen saturation by measuring the partial pressure of hemorrhage oxygen PO2. This method is cumbersome and cannot be continuously monitored.
2, Using finger-type photoelectric sensor, when measuring, just put the sensor on the human finger, using the finger as a transparent container containing hemoglobin, using red light with a wavelength of 660 nm and near-infrared light of 940 nm as the incident light source, The light transmission intensity through the tissue bed is measured to calculate the hemoglobin concentration and blood oxygen saturation, and the instrument can display human blood oxygen saturation, providing a continuous non-invasive blood oxygen measuring instrument for clinical practice.
SpO2 is the percentage of oxygen-bound hemoglobin (HbO2) in the blood that accounts for the total capacity of hemoglobin (Hb, hemoglobin), which is the concentration of blood oxygen in the blood. It is a breath. Important physiological parameters of the cycle. The functional oxygen saturation is the ratio of HbO2 concentration to HbO2+Hb concentration, which is different from the percentage of oxyhemoglobin. Therefore, monitoring arterial oxygen saturation (SaO2) can estimate lung oxygenation and hemoglobin oxygen carrying capacity. The blood oxygen saturation of normal human arterial blood is 98%, and venous blood is 75%.