No O2 data in Vitals for Apple Watch Series 11 and iPhone 16 Pro

Hello, I have Watch Series 11 and iPhone 16 Pro.


Health app is not tracking my O2 in Vitals during sleep, I have empty column and message No Data for O2 in Vitals.


I can see O2 measurements in Respiratory tab of Health app but they are not synced with Vitals.


I have the newest iOS and watchOS.



[Re-Titled by Moderator]

Original Title: Blood oxygen in Vitals

Apple Watch Series 11, watchOS 26

Posted on Nov 5, 2025 2:07 AM

Reply
4 replies

Dec 15, 2025 5:36 AM in response to damir108

Same here. My iPhone 16 Pro with Apple Watch Series 9 showed O2 in Vitals. Now with Series 11 and same phone, Vitals shows an empty column where O2 should be and just says “No Data” if you tap it. This is through two nights of use so far since upgrading my watch. If I go I to Health -> Respiratory -> Blood Oxygen, there have been readings taken overnight. I was already using IOS 26.2 and WatchOS 26.2 before switching from Series 9 to Series 11.

No O2 data in Vitals for Apple Watch Series 11 and iPhone 16 Pro

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