Introduction of the SpO2 parameter

author: Tyler Wang
07/06/2022
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Introduction of the SpO2 parameter


Blood oxygen refers to the oxygen in the blood. The normal oxygen content of the human body is about 90%. The higher the oxygen content in the blood, the better a person's metabolism is. Of course, high blood oxygen levels are not a good sign. The blood oxygen in the human body has a certain saturation. If it is too low, it will cause insufficient oxygen supply to the body, and if it is too high, it will cause the cells in the body to age. Two important definitions: 1. Oxygen partial pressure (PO2) refers to the tension generated by the oxygen molecules dissolved in the plasma in the physical state (so it is also called oxygen tension). 2. Oxygen saturation refers to the percentage of hemoglobin-bound oxygen to saturation.

We measure blood oxygen by: Transcutaneous oximetry: is the easiest method. A simple blood oxygen saturation clip can be purchased for percutaneous oxygen saturation measurement, clip on the nail, and measure the percutaneous oxygen saturation content. At plains and sea level, normal values ​​for transcutaneous oxygen saturation are above 93%. If there is corresponding lung disease and airway disease, blood oxygen saturation may drop. When the oxygen saturation through the skin is below 90%, it may have varying degrees of effects on the body.

If the partial pressure of oxygen is greater than 60% or 60mmHg, the oxygen saturation can be maintained above 90%, which is an adequate level. When the blood oxygen partial pressure is lower than 60mmHg, the patient may experience varying degrees of blood oxygen saturation, resulting in symptoms such as hypoxia, dyspnea, wheezing, and obvious symptoms such as chest tightness and suffocation.