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Low blood oxygen levels or hypoxemia have been linkedbecause the disease affects your ability to get enough oxygen. Doctors have used SpO2 levels to determine the severity of COVID-19 cases and treat these patients accordingly.
However, hypoxemia can be caused by many other heart and lung problems, such as asthma, pneumonia, and congenital heart disease. By monitoring your SpO2, your Apple Watch may be able to warn you of potential health issues before you even know you have them, or at least that’s Apple’s hope.
Here’s how to use the Apple Watch Series 6’s Blood Oxygen feature. It is currently only available for the Series 6, not for other models.
How does the blood oxygen sensor work?
The blood oxygen sensor is built into the back of the Apple Watch. It uses four clusters of red, green, and infrared LED lights and four photodiodes, devices that convert light into electrical power. The lights shine on the blood vessels in your wrist and the photo diodes measure how much light is bouncing back.
I won’t go into the medical specifics, but essentially oxygenated and deoxygenated blood absorbs red and infrared light differently, so the rebounding light allows the Apple Watch to determine the color of your blood.
Bright red blood is more oxygenated, while dark red blood contains less oxygen, either because it is delivering oxygen to your organs and muscles or because it is not getting enough oxygen from your lungs.
If you want to know exactly how pulse oximeters work, check out this article published in the medical journal of respiratory medicine.
How do you use the Blood Oxygen App?
With Apple Watch Series 6, you can read your SpO2 when you need it. Just open the app and follow the instructions on the screen.
The reading takes 15 seconds. Once the reading is complete, the percentage of oxygen in your blood will be displayed on the screen.
The watch measures regularly throughout the day when you are inactive, e.g. B. when you are lying or sleeping on the couch. All of your blood oxygen levels are synchronized with the.
The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a doctor or other qualified health care provider with any questions about a disease or health goals.