Blood oxygen sensing returns to Apple Watch Series 9, 10, and Ultra Watch 2 in the US following a software update. Users must update their iPhone to iOS 18.6.1 and the watch to watchOS 11.6.1 to see this feature. The update is a result of a US Customs ruling related to a patent infringement lawsuit by Masimo against Apple. The blood oxygen sensing feature had been omitted from the latest Apple Watch models until this update, addressing a key feature users have missed during the pandemic and beyond.
If you have an Apple Watch Series 9, 10, or Ultra Watch 2 purchased in the US in the past year, you will receive blood oxygen sensing via a software update.
Apple's watchOS 11.6.1 allows users to see blood oxygen levels in the Health app's Respiratory section after updating their iPhone to iOS 18.6.1.
A recent US Customs ruling resolved a dispute with Masimo, which claimed Apple violated a patent related to optical blood monitoring, resulting in a judged infringement.
The blood oxygen sensing feature became more crucial during the Covid-19 pandemic, leading to increased awareness and usage of pulse oximeters.
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