How do I track blood oxygen saturation (SpO2) with my Fitbit device?

Your Fitbit device uses sensors to estimate your blood oxygen saturation (SpO2) while you sleep.

Important: The Fitbit SpO2 feature is intended for general wellness purposes only and should not be used or relied on for any medical purposes. Consult your health care professional about any questions or health issues you may have.

Expand all Collapse all

Learn what SpO2 means

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.

Check your SpO2 readings

Important: Fitbit SpO2 is not available in all regions. For more information on availability, refer to Health Metrics.

To collect SpO2 data, install an SpO2 clock face or the SpO2 app. You may have to charge your Fitbit device more often when collecting SpO2 data.

Tip: SpO2 tracking is automatically added on Google Pixel Watch series. You don’t need to install a clock face or app. If you can't find the feature on your watch, update to the latest firmware.

Install an SpO2 clock face (Inspire 3, Sense series, and Versa series only)

From the Today tab in the Fitbit app, tap Devices and select your device.
Tap Gallery Clocks tab.
Search for "SpO2."
Tap the clock face you want to install Install.
Follow the on-screen instructions to grant the required permissions and install the clock face.

Install the SpO2 app (Charge 4, Charge 5, Charge 6, Inspire 3, Luxe, Sense series, Versa 3, and Versa 4 only)

On certain Fitbit devices, the SpO2 app is automatically added for users in select countries. If it’s not installed:

From the Today tab in the Fitbit app, tap Devices and select your device.
Tap Gallery.
Search for "SpO2."
In the results, tap SpO2 or SpO2 Tracker Install.

Tips:

The SpO2 app doesn’t appear as an app on your watch. Instead, it runs in the background to track your SpO2 data.
If you can't add an add an SpO2 clock face or the SpO2 app to your Fitbit device, update your Fitbit device to run the latest firmware version.

Check your most recent SpO2 levels on your device

On your SpO2 clock face (Inspire 3, Sense series, and Versa series only)

Check your nightly SpO2 data on an SpO2 clock face:

Wear your Fitbit device to bed and sync it in the morning.
Check the clock face for your average SpO2 level and the range of values detected.

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. This update happens after your device syncs with the Fitbit app.

In the SpO2 app (Charge 4, Charge 5, Charge 6, Inspire 3, Luxe, Sense series, Versa 3, and Versa 4 only)

Check your nightly SpO2 data in your daily stats:

Check your daily stats:
- Sense series, Versa 3, and Versa 4: Open the Today app on your watch.
- Charge 4, Charge 5, Charge 6, Inspire 3, and Luxe: Swipe up from the clock face
Swipe up to find the Oxygen Saturation or SpO2 tile. You’ll find your most recent average resting SpO2 level.
On Sense and Versa 3, tap the Oxygen Saturation tile to find your SpO2 range and 7-day graph.

It may take around an hour for your SpO2 values to appear after you wake up. The 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.

In the Fitbit Today app (Google Pixel Watch series)

Open the Fitbit Today app on your watch.
Swipe up to find the Oxygen Saturation tile. You’ll find your most recent average resting SpO2 level.
Tap the Oxygen Saturation tile to find your SpO2 range and 7-day graph.

Track your SpO2 trends in the Fitbit app

Check your SpO2 trends in the Health Metrics tile in the Fitbit app on your phone.

Wear your device for at least a full day, including to sleep at night.
In the morning, open the Fitbit app and tap the Health Metrics tile.
Tap Oxygen Saturation.

To collect SpO2 data on the following devices, make sure to:

Versa, Versa Lite Edition, and Versa 2: Use an SpO2 clock face.
Inspire 3, Sense series, Versa 3, and Versa 4: Install either an SpO2 clock face or the SpO2 app.
Charge 4, Charge 5, Charge 6, and Luxe: Install the SpO2 app.
Google Pixel Watch series: SpO2 tracking is automatically added.

Learn how your Fitbit device measures your SpO2 level

Your Fitbit device measures your SpO2 levels while you sleep using red and infrared sensors on the back of the device. These sensors shine red and infrared light onto your skin and blood vessels. Then, they use the reflected light that bounces back to estimate how much oxygen is in your blood:

Richly oxygenated blood reflects more red light than infrared light.
Poorly oxygenated blood reflects more infrared light than red light.

Note that the red and infrared sensors may continue to blink for around 30 minutes after you wake up.

Learn about your SpO2 values

Your SpO2 values naturally vary. The values are often lower at night because 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.

Learn why you received a low SpO2 value

You may notice an SpO2 value that seems lower than expected. This can be due to:

Your arm position and movement
The position and fit of your Fitbit device
Limited blood flow to the surface of the skin
Differences in anatomical body structures can also impact the accuracy of your Fitbit device’s sensors.

Several factors can affect your body's ability to maintain blood oxygen levels. These include, but aren't limited to, the following:

There must be enough oxygen in the air you're breathing.
Your lungs must be able to inhale air containing oxygen and exhale carbon dioxide.
Your bloodstream must be able to carry oxygen throughout your body.

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.

Learn why you didn't receive your SpO2 data

Sometimes, you may not receive your SpO2 data and experience any of the following:

Dashed lines on the clock face or SpO2 data tile
A message that the SpO2 data couldn’t be read
Missing data in the Health Metrics tile in the Fitbit app on your phone

When that happens, please keep in mind that:

Your device doesn’t retroactively measure your SpO2 values. When you start using Fitbit SpO2, you’ll have dashed lines until after your next sleep session.
You must get at least 3 hours of quality sleep. Data is only collected when you’re still. If you move a lot during your sleep or the sleep session is too short, you might not get SpO2 data.
You should charge your Fitbit device to make sure it’s able to collect data throughout your entire sleep session. You may have to charge your Fitbit device more often when using an SpO2 clock face or app.
You must sync your Fitbit device with the Fitbit app before the clock shows your SpO2 data. It may take around an hour for your SpO2 values to appear after you sync your device. For troubleshooting syncing, go to Why won't my Fitbit device sync?
Turning off any SpO2 clock face or app permissions can cause the feature to stop functioning. For instructions on adjusting permissions, go to How do I install and manage apps on my Fitbit device?
Your Fitbit device must be able to consistently track your SpO2 data:
- Wear your device slightly higher on your wrist.
- Make sure your device is in contact with your skin.
- Your device should be snug but not constricting.
- Tattooed skin can impact the accuracy of the red and infrared sensors on your Fitbit device.

Tips:

If you get the message “SpO2 not installed” on your clock face, install the SpO2 Tracker app.
For Google Pixel Watch series, if you can’t find the SpO2 tile or the tile is missing data, make sure the Fitbit and Health Services apps are up-to-date.

Remove SpO2 tracking from your Fitbit device

To remove SpO2 tracking from your device, you must remove both the SpO2 clock face and the SpO2 app. One or both might be installed depending on your Fitbit device.

Tip: SpO2 tracking is automatically added on Google Pixel Watch series. It doesn’t use a clock face or app and can’t be removed.

Replace your SpO2 clock face

To remove SpO2 tracking, change your clock face to one not listed in the SpO2 clock face category:

From the Today tab in the Fitbit app, tap Devices and select your device.
Tap Gallery Clocks tab.
Tap the clock face you want Install.
Follow the on-screen instructions to install the new clock face.

Uninstall the SpO2 app

From the Today tab in the Fitbit app, tap Devices and select your device.
Tap Gallery SpO2 or SpO2 Tracker.
Tap Uninstall Uninstall.

Learn the difference between estimated oxygen variability and SpO2

Estimated oxygen variation (EOV) is an estimate of the changes in your blood oxygen saturation levels. The EOV feature is designed to track specific events overnight when your blood oxygen saturation levels varied, which could indicate breathing disturbances. For more information, you can go to How do I track my estimated oxygen variation in the Fitbit app?

Fitbit SpO2 estimates your average blood oxygen saturation levels and range while you sleep. It’s designed to track potential changes to your fitness and wellness.

Was this helpful?

How can we improve it?