Google began rolling out its Health Guardian features in the Google Health app on 24 September, adding blood pressure trends, insulin resistance trends and sleep breathing quality metrics for Pixel Watch users. The announcement says the metrics can be set up this week, with the first trend reports arriving in early October.
The features run continuously in the background to track what Google calls subtle physiological shifts over time. They are included free with Pixel Watch 3, 4 and 5; Fitbit Air users will get insulin resistance and blood pressure trends with a paid Google Health Premium subscription later this year.
Why it matters: one feature in the suite acts on its own. Breathing Emergency Detection, for Pixel Watch 4 and 5, is designed to automatically prompt a call to emergency services if a user suffers severe drops in blood oxygen. That is on-device inference deciding to escalate to an ambulance, and it is launching in select European countries rather than the United States.
Google says the features are backed by clinical research but names no study, publishes no accuracy or false-positive figures, and does not say which European countries are covered. For a tool that can summon emergency services, those are precisely the numbers that matter, and they are not in the announcement.