Apple Watch series has been equipped with blood oxygen sensors and supporting applications since 6, providing more ways to monitor heart and respiratory health. Together, they measure the oxygen saturation (SpO2) in blood and the amount of oxygen absorbed by red blood cells from the lungs and transported to other parts of the body.
Apple watch can also continuously monitor your blood oxygen saturation at night, which is especially useful for people with respiratory syndrome. In addition, when your oxygen saturation (SpO2) is lower than the normal level, it will automatically send out an early warning to remind you to pay attention to your health.
Methods of measuring blood oxygen:
1. blood oxygen clamp: It is the simplest method to measure blood oxygen saturation with finger pulse oxygen. You can buy a simple oxygen clip for percutaneous oxygen saturation measurement and clip it on your finger to measure the content of percutaneous oxygen saturation. Generally speaking, the normal value of percutaneous oxygen saturation is above 93%.
2. Finger sleeve of photoelectric sensor: When the photoelectric sensor measures, it is only necessary to sleeve the sensor on a person's finger, use the finger as a transparent container for containing hemoglobin, and use wavelength and red light as the light source that enters the finger, and calculate the oxygen saturation or other values by measuring the sensitivity of incident light. This instrument is widely used in clinic and can provide continuous measurement data, which is harmless to human body.
3. Arterial blood gas analysis: it is the most classic method, and it is necessary to extract arterial blood for corresponding blood gas analysis. Under sea level and plain conditions, the normal value is 80- 100mmHg.