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How to measure blood oxygen level with Apple Watch
Apple Watch Series 6 can tell how much oxygen is in your blood, which could help manage COVID-19 symptoms such as low oxygen:
The Apple Watch Series 6 has a sensor built in that can measure the oxygen level in the blood. This ability could have a real benefit in judging health and reacting to the first signs of conditions such as heart failure, asthma and managing Coronavirus symptoms or even identifying COVID-19. The NHS guide to staying safe while recovering from Coronavirus at home indicates that: “If you use a pulse oximeter, your blood oxygen level is 94% or 93% or continues to be lower than your usual reading where your normal oxygen saturation is below 95%” you could call NHS 111.
In addition the recommedation is that if “your blood oxygen levels are 92% of less [having retaken your reading first] you should go to A&E or call 999 within an hour of the measurement.
With these recommendations it is no surprise that people are currently searching for blood oxygen meters, and of course the Apple Watch 6 has one included. In this article we will look at how to use the Apple Watch 6 to measure your blood oxygen, how accurate it is, and when you should be concerned about a reading. The Apple Watch 6’s oxygen measuring abilities could be a good reason to purchase or borrow one if you are experiencing Coronavirus-related breathing problems.
How Apple Watch 6 measures oxygen levels:
To make oxygen measurements possible Apple has changed the lay out of sensors on the lower side of the Apple Watch with the Series 6. Now, in addition to the green and infrared LEDs, there are additional red LEDs and some additional photodiodes.
The principle of oxygen measurement is the same or similar to that of pulse measurement: the four LED clusters illuminate the skin and underlying blood vessels, the photodiodes register the light reflected back and can use algorithms to calculate how much oxygen the red blood cells are currently transporting in the body.
This calculation is based on the knowledge that the more oxygen binds to the red blood cells, the redder the blood appears. The protein responsible for oxygen binding, haemoglobin, contains iron-containing complexes that can bind to the oxygen molecules. Upon binding the colour changes from dark red to light red – this change can be picked up by the photo diodes of the Apple Watch.
An extra app is required on the Apple Watch for the measurement and monitoring of blood oxygen levels. The Blood Oxygen app guides the user through the measurement and displays the measured data. This information is also added to the health app under the new tab Blood Oxygen.
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