It's in the Apple PR https://www.apple.com/newsroom/2025/08/an-update-on-blood-o...

		chedabob 8 months ago \| parent \| context \| favorite \| on: Blood oxygen monitoring returning to Apple Watch i... It's in the Apple PR https://www.apple.com/newsroom/2025/08/an-update-on-blood-ox... > sensor data from the Blood Oxygen app on Apple Watch will be measured and calculated on the paired iPhone