“Once enabled, it requires 10 nights of sleep tracking data spread out over a 30-day span to determine whether a user may have the condition.”
The FDA cleared it for the Series 9, Series 10 and Ultra 2 four days before the Series 10 ships. Apple says it is “not a diagnostic tool,” so the output is a nudge to see a doctor. Withings and Samsung got there first. Blood oxygen detection stays switched off on US watches over a patent dispute, so Apple adds one health feature while a court holds another.