About the oxygen saturation of blood.
Blood oxygen saturation (SpO2) is the percentage of the total amount of hemoglobin (hb,hemoglobin) that can be combined with oxygen-binding oxygen-hemoglobin (HbO2) in the blood, that is, the blood oxygen concentration in the blood, which is an important physiological parameter of respiratory cycle. However, functional oxygen saturation was the ratio of HbO2 concentration to HBO2+HB concentration, which was different from the percentage of oxygen-combined hemoglobin. Therefore, the monitoring of arterial oxygen saturation (SaO2) can be used to estimate the oxygenation of the lungs and the oxygen-carrying capacity of hemoglobin.
The blood oxygen saturation of normal human arterial blood was 98%, and venous blood was 75%. The metabolic process of the human body is the process of biological oxidation, and the metabolic process of oxygen, is through the respiratory system into the human blood, and blood erythrocytes in the hemoglobin (Hb), combined with oxygen and hemoglobin (HbO2), and then transported to the body parts of the tissue cells. The ability of blood to carry oxygen is measured by the saturation of blood oxygen.