The error value of blood oxygen saturation measured by cell phone

Oximeter mainly detects the human body's blood oxygen saturation, reflecting the condition of human tissue and organ oxygen supply, normal human blood oxygen content value of 95% to 100%, if less than 90%, often suggesting that there are symptoms of hypoxemia. China Medical University biomedical engineering professional responsible for Professor Sha Xianzheng said, now online sales of some finger clip oxygen saturation monitor and electronic bracelet, as well as some smart watches are the use of optical methods to achieve the detection of human blood oxygen saturation function. Generally speaking, cell phone software to measure heart rate is more accurate, in terms of measuring blood oxygen saturation, but also through the cell phone camera to measure the human body to absorb the reflection of different wavelengths (colors) of light, to calculate the degree of hemoglobin and oxygenated hemoglobin absorption, and measurement. However, due to the different camera performance of different cell phones, the accuracy of oxygen saturation measurement is not very accurate. Of course, the measurement accuracy of the mobile app is not as good as that of the blood oxygen monitor for medical professional use. The normal range of blood oxygen saturation level is very narrow, and the measurement accuracy is a little bit worse than a lot. Some unregistered home use oximetry monitors or mobile apps are just for monitoring and reference. Therefore, for the sake of health, if you want to accurately detect the oxygen saturation level, you need to use a professional device, and the cell phone app is only a reference in this regard.