Archive · 15 Aug 2025
Apple Revamps Blood Oxygen for US Apple Watch with iPhone
Apple is bringing back the blood oxygen feature to some of its Apple Watch models in the US.
This change follows a legal issue with Masimo, a medical tech company that claimed Apple was using its technology without permission.
Apple redesigned the feature; now the paired iPhone handles the calculations instead of the watch.
To use the feature, update your iPhone and Apple Watch software.
The new feature will be available for the Series 9, Series 10, and Ultra 2 models.
Apple is reintroducing the blood oxygen feature to Apple Watch in the US.
This follows a legal dispute with Masimo.
The feature is available for Series 9, Series 10, and Ultra 2 models.
Users need to update iPhone and Apple Watch software.
The iPhone now processes blood oxygen data.
- Who
- Apple Watch Series 9, Series 10, and Ultra 2 users in the US.
- What
- Apple is reintroducing the blood oxygen feature to select Apple Watch models.
- When
- After software updates.
- Where
- United States
- Why
- Following a U.S. Customs ruling and workaround.
Apple
Masimo
Patent Dispute
Apple
Implemented workaround to restore feature.
Masimo
Masimo sued Apple for patent infringement.
- Affected Devices
- Apple Watch Series 9, 10, and Ultra 2 (US)
- Feature
- Blood Oxygen Monitoring
- Software Update Required
- iOS 18.6.1 and watchOS 11.6.1
- Data Processing
- iPhone
- Geographic Restriction
- United States
Sources
Apple brings back Blood Oxygen feature to Apple Watch, but there’s a catch
Apple Watch Gets Revamped Blood Oxygen Feature
Apple Rolls Out Blood Oxygen Feature Overhaul for Select Apple Watch Models: Check If Your Watch is Eligible