> The iPhone will now calculate the ratio of absorbed red to infrared light, the... | Hacker News

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		Angostura 7 months ago \| parent \| context \| favorite \| on: Blood oxygen monitoring returning to Apple Watch i... > The iPhone will now calculate the ratio of absorbed red to infrared light, then apply calibration constants from experimental data to estimate blood oxygen saturation. Sorry, maybe I missed it - but source for this?

chedabob 7 months ago | [–]

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

clint 7 months ago | [–]

The literal article that is the sole focus of this entire thread?

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