In order to make up for the influence of natural skin differences and improve the accuracy, the blood oxygen sensor adopts four groups of green, red and infrared LED clusters and four photodiodes, all of which are integrated on the back of the crystal glass of Apple Watch, and can measure the light reflected by blood. Subsequently, apple Watch will use the advanced algorithm built in the Blood Oxygen App to measure the blood oxygen level, which can be measured between 70% and 100%. Users can take measurements when they are at rest; When the user is not very active, including during sleep, the device will also make regular measurements in the background. All the data can be viewed in the health app, and users can track the trend over a period of time and understand the changes of their blood oxygen levels.
* Oxygen saturation (SpO2) refers to the percentage of oxygen carried by red blood cells when they transport oxygen from the lungs to the whole body, and it is an important indicator to measure the oxygen-carrying blood transport of the whole body.
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