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How to use your Apple Watch to measure your blood oxygen levels

Keep close tabs on your health and fitness.

Published onMarch 22, 2023

SpO2 is more than just a buzzword when it comes to smartwatches, it’s an important metric for insight into your overall health. Find out how to measure your blood oxygen levels using your Apple Watch.


To measure blood oxygen on your Apple Watch, open the Blood Oxygen app and tap start.


Why is blood oxygen monitoring important?

An Apple Watch Series 6 displays a user's blood oxygen results.
Jimmy Westenberg / Android Authority

Blood oxygen measurements, or SpO2 levels, represent what percentage of oxygen you have in your blood. Since we depend on oxygen to function, this measurement can be an important indicator of our overall health. Higher SpO2 levels are a good thing. A normal reading is anything between 95% and 99%. Low levels of blood oxygen, meanwhile, can lead to dangerous symptoms known as hypoxemia.

How to set up background readings

Blood oxygen monitoring is available on the Apple Watch Series 6, Series 7, Series 8, and Ultra. Make sure your device is running the latest watchOS to take advantage of this useful feature. According to Apple, this tool is designed for users aged 18 and older.

When you set up your device for the first time, the Blood Oxygen app should be installed in the Health app. If needed, you can reinstall the app from the App Store on your Apple Watch.

  • On your paired iPhone, open the Health app and follow the onscreen prompts to set up the Blood Oxygen app. If you don’t receive a prompt, tap the Browse tab.
  • Tap Respiratory.
  • Tap Blood Oxygen, then scroll down to and tap Enable.

Your Apple Watch will occasionally measure your blood oxygen levels when you are not moving if background measurements are on. The device will only take blood oxygen measurements overnight if you are tracking sleep with your Apple Watch. You can disable these measurements if the sensor’s light disrupts your sleep.

How to take an on-demand measurement

Compatible Apple Watches also allow you to take blood oxygen measurements on demand. For an accurate reading, make sure your band is snug and that the back of your Apple Watch is touching your skin. Your watch should rest an inch or two above your wrist bone.

  • Open the Blood Oxygen app on your Apple Watch.
  • Rest your arms on a table, keeping your wrist and palm down and flat.
  • Tap Start and keep still for the duration of the measurement.
  • Tap Done. Visit the Health app on your paired iPhone to review your results.

Where to view your blood oxygen readings

You can find all your blood oxygen data in the Health app on your paired iPhone.

  • Open the Health app and tap the Browse tab.
  • Begin typing blood oxygen into the search bar and tap the Blood Oxygen icon when it appears.
  • Tap Show More Blood Oxygen Data to view more details.

If you would like your blood oxygen data to appear in the Summary tab, scroll down and tap Add to Favorites.


No, the Apple Watch SE 2 cannot measure blood oxygen. The device drops advanced health sensors in favor of a lower price tag.

While Apple’s SpO2 monitoring is considered to be largely accurate, the Apple Watch is not intended to be used as a medical device.

Apple’s Blood Oxygen app is only available in certain regions and countries. Click here for a complete list of locations.

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