Your Fitbit smartwatch uses sensors to estimate your blood oxygen saturation (SpO2) while you sleep.
This scientific letter considers the rationale for the target oxygen saturation measured by pulse oximetry (SpO2) range of 92-96% for oxygen therapy in adult patients without COPD or other conditions associated with chronic respiratory failure, recommended by the Thoracic Society of Australia and New Zealand, in contrast to the 94-98% target range recommended by the British Thoracic Society. Anyways, I'm not sure why, all things considered, my sp02 is consistently only 95%. I work on an ambulance and have used a couple different monitors that we have available and use on our patients. Mainly always 95% and sometimes 96%.
What is SpO2?Your blood oxygen saturation (SpO2) is the percentage of your blood that’s saturated with, or contains, oxygen. The oxygen levels in your blood tend to remain relatively constant, even during exercise and sleep.
How can I see my SpO2 reading?To collect SpO2 data, install an SpO2 clock face (available on Ionic, Sense, and Versa series) or the SpO2 app (available on Sense and Versa 3).
To install an SpO2 clock face:
The SpO2 clock faces are only available in certain countries at this time. If you don’t see them in the Clock Face Gallery, the feature isn’t available in your region. For more information on the availability of Fitbit SpO2, see fitbit.com.
If you have trouble adding an SpO2 clock face to your Fitbit device, make sure you update your watch to run the latest version of Fitbit OS. For instructions, see How do I update my Fitbit device?
To install the SpO2 app (Sense and Versa 3 only):
The SpO2 app doesn’t appear as an app on your watch; instead, it runs in the background to track your SpO2 data. View your results in the Fitbit app.
Note that your watch must be running Fitbit OS 5.1 to install the SpO2 app. For more information on updating your watch, see How do I update my Fitbit device?
Charge 4The Fitbit SpO2 app is automatically added for users in select countries. For more information on updating your tracker, see How do I update my Fitbit device? For more information on the availability of Fitbit SpO2, see fitbit.com.
If you removed the SpO2 app from your device, reinstall it in the Fitbit app on your phone:
See your nightly SpO2 data on an SpO2 clock face:
It may take around an hour for your SpO2 values to appear on the clock face after you sync your device. The clock face shows data for your most recent sleep session. If your sleep session is split into 2 separate logs or you take a long nap, the clock face updates to show data for the most recent sleep session after your device syncs with the Fitbit app.
Charge 4It may take around an hour for your SpO2 values to appear after you wake up. The SpO2 tile shows data for your most recent sleep session. If your sleep session is split into 2 separate logs or you take a long nap, the tile updates to show data for the most recent sleep session.
See your SpO2 trends in the Health Metrics tile in the Fitbit app on your phone. The Health Metrics tile is available with Fitbit Charge 4, Fitbit Sense, Fitbit Versa 2, and Fitbit Versa 3. To see historical data, upgrade to Fitbit Premium. For other devices, a Fitbit Premium subscription is required to see health metrics data.
Note that for Ionic, Versa, Versa Lite Edition, and Versa 2, SpO2 data is only collected when you use an SpO2 clock face. For a list of compatible SpO2 clock faces, see Add SpO2 to your Fitbit device. For Sense and Versa 3 you can install either an SpO2 clock face or the SpO2 app to collect SpO2 data. Charge 4 users must have the SpO2 app installed.
How does my Fitbit device measure my SpO2 level?Your Fitbit device measures your SpO2 levels while you sleep using red and infrared sensors on the back of the device. The sensors shine red and infrared light onto your skin and blood vessels, and use the reflected light that bounces back to estimate how much oxygen is in your blood:
Note that you might see the red and infrared sensors continue to blink for around 30 minutes after you wake up.
What should I know about SpO2 values?SpO2 values naturally vary, and nighttime SpO2 is usually lower than daytime SpO2 due to the fact that your breathing rate is usually slower during sleep. In general, SpO2 values during sleep are typically above 90%. The SpO2 values presented are an estimate and in general can be influenced by your activity, altitude, and overall health.
Why did I receive a low SpO2 value?You may notice an SpO2 value that seems lower than expected. This can be due to:
Several factors can affect your body's ability to maintain blood oxygen levels. These include, but are not limited to, the following:
An issue with any of these factors could impact your SpO2 values. For example, in high altitudes the air is less dense and therefore contains less oxygen. If you experience low SpO2 values while at high altitudes you may want to consider descending to a lower altitude.
Certain health problems can also impact the body's ability to take in oxygen. These factors can be compounded under more extreme circumstances such as during intensive exercise.
You should not use or rely on the SpO2 reading on your Fitbit device for any medical purposes. If you have concerns about your health, you should consult your healthcare provider.
If you see the message “SpO2 not installed” on your clock face, install the SpO2 Tracker app. For instructions, see Add SpO2 to your Fitbit device.
If you see dashed lines on the clock face or SpO2 tile, a message that the SpO2 data couldn’t be read, or missing data in the Health Metrics tile in the Fitbit app on your phone, keep in mind the following:
You may have to charge your Fitbit device more often when collecting SpO2 data.
How do I remove SpO2 tracking from my Fitbit device?Ionic, Sense, and Versa seriesTo remove SpO2 tracking, change your clock face to one not listed in the SpO2 clock face category:
If you installed the SpO2 app, uninstall it:
Estimated oxygen variation (EOV) is an estimate of the changes in your blood oxygen saturation levels. For instructions, see How do I track my estimated oxygen variation in the Fitbit app? The EOV feature is designed to see specific events overnight when your blood oxygen saturation levels varied, which could indicate breathing disturbances.
Fitbit SpO2 estimates your average blood oxygen saturation levels and range while you sleep. It’s designed to see potential changes to your fitness and wellness.
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