Huawei watch's blood oxygen accuracy or Apple watch's blood oxygen accuracy

The accuracy of the two blood oxygen tests is comparable, but neither of them is up to medical grade. In addition to invasive testing in the hospital, most of the blood oxygen test or pulse oximeter to carry out, and the principle of the oximeter is through the red LED + infrared LED emission of specific wavelengths of light, and then by the device to receive the reflected or projected light, the finger clip type oximeter is used in the projected, and smart watches and smart bracelets such as the wrist device, taking into account the transmittance and the strap of the reason, natural Smart watches and smart bracelets, such as wrist devices, taking into account the transmittance and strap, naturally, it is not good to use the projected type, so they all use the reflected type.

But there are still differences in the accuracy of the two, we take Apple's Apple Watch as an example, we can see when we look at the parameters, Apple's heart rate monitoring function is over the U.S. FDA certification, but its oxygen saturation monitoring is not certified, and most of the smart wearable devices this function is not certified by the FDA. This can also be seen in the domestic devices, such as Huawei's Watch GT 3 Pro ECG ECG analysis through the national NMPA Class II medical device certification, but through the certification of the wrist oximeter is almost nothing, even if there is also unrelated to smart wearable devices. It can be seen that smart wearable device program, to achieve medical level of blood oxygen measurement is still a certain degree of difficulty