From the Apple Watch Series 6 and later, you can measure your blood oxygen levels directly from your wrist. See exactly how such a thing can be done!
How oxygen monitoring works on the Apple Watch
Apple states that the function of monitoring oxygen in the blood is not intended for medical use. Instead, it was designed for "general fitness and wellness purposes." Unlike the EKG function, the blood oxygen monitor did not pass rigorous FDA testing and certification.
There is a reason why Apple is issuing this warning in advance. The application of Blood Oxygen on the Apple Watch is not very reliable. Compared to a simple blood oxygen monitor, it does not provide the most accurate Results.
The inaccuracy is due to the fact that the Apple Watch measures the oxygen levels in your blood through your wrist. It has four LEDs and LEDs on the back of the watch. It lights up green, red and infrared LEDs on the blood vessels in your wrist. The LEDs then measure the amount of light reflected back.
Apple has created a special algorithmic system that collects all this data to calculate how much oxygen is in your blood based on color.
The Apple Watch can show from 70 to 100% of the level of oxygen in the blood. Generally, 95-100% is considered the normal range. If you have consistently low readings (below 90%), this may be an indication of an underlying condition. Of course, only a doctor can tell you for sure if something is wrong.
How to enable blood oxygen monitoring on the Apple Watch
The Blood Oxygen app works on Apple Watch Series 6 and later, with WatchOS 7 or later. To enable the feature, you must be using an iPhone 6s or later with iOS 14 or later. This feature does not work in Apple Watches using Family Setup or for people under 18 years old.
The function must be activated manually during the process installation of the Apple Watch. If you did not receive the message, you can activate it from the Watch app.
Open the Watch app on your iPhone. On the "My Watch" tab, select "Blood Oxygen".
Here, select the "Blood Oxygen Measurements" option.
This feature automatically allows background measurements in suspend mode. You can also turn it on in In Theater (or Cinema) Mode in the Allow Background Measurements section.
How to measure the levels of oxygen in your blood
After activating the function, reading oxygen in the blood from the Apple Watch is quite simple.
Tap Digital Crown on the right side of the Apple Watch to open the app. Here, select the Blood Oxygen application.
Click "Start" to start measurement. The process takes 15 seconds. During this period, rest your wrist on a table or other flat surface.
After 15 seconds, you will see the oxygen levels in your blood. Click "Done" to save the result. The results are also automatically saved in the Health application in iPhone you.
Source of information: howtogeek.com