Blood oxygen levels refer to the amount of oxygen circulating in the blood. Normal blood oxygen levels fall between 75 and 100 millimeters of mercury (mm Hg) on arterial blood gas (ABG) test results.

Apple Watch owners in the U.S. just got a big reason to update their devices. Apple just rolled out a redesigned Blood Oxygen feature to specific models, following a recent victory in a legal dispute.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Apple Watches sold in ...

If you own a recent Apple Watch, you'll soon regain access to blood oxygen monitoring. Later today, owners of the Apple Watch Series 9, Series 10, and Ultra 2 will be able to download an update that ...

For millions of Apple Watch Series 9, Series 10 and Ultra 2 users who didn’t have the blood oxygen monitoring (SpO2) feature on their smartwatches, last week’s software updates offered a key ...

Apple just brought blood oxygen tracking back to millions of Apple Watch Series 9, Series 10 and Ultra 2 models, missing since early 2024, when Apple removed it. Here’s what’s happened, how the new ...

A U.S. Customs ruling has allowed Apple to restore blood oxygen readings for U.S. Apple Watch buyers for whom the feature was disabled in early 2024. For these users, the redesigned approach works by ...

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Apple announced on Thursday it’s introducing a redesigned Blood Oxygen feature for some Watch Series 8, Series 10, and Apple Watch Ultra. With this move, Apple is bringing back blood oxygen monitoring ...

The seventh developer betas of iOS 26 and watchOS 26 include a redesigned Blood Oxygen feature on Apple Watch Series 9, Apple Watch Series 10, and Apple Watch Ultra 2 models sold in the U.S. since mid ...