Users of some Fitbit devices can now access the blood oxygen saturation (SpO2) graph.
The reading is done through the infrared sensors on the back of models Versa, Versa Lite, Versa 2, Ionic and Charge 3. The function has been activated with a software update.
Blood oxygen variability levels can help detect a number of conditions including sleep apnea, a condition that affects between 5% and 10% of the population. People with this condition are more at risk of high blood pressure or heart problems, type 2 diabetes and daytime fatigue. This value is now present in the sleep quality section of the Fitbit app.
Fitbit is not the only wearable company to have introduced this feature. At CES 2020 in Las Vegas Withings presented ScanWatch, a smartwatch that has a SpO2 sensor.
Digital-health 