User level: Level 1 (4 points)Does the increase in heart rate monitoring to every 5 seconds on Apple Watch Ultra 4 & Watch OS 27 translate to an increase in AFib monitoring frequency?
Posted on Sep 17, 2026 9:38 AM
User level: Level 8 (43,363 points)Sep 17, 2026 1:42 PM in response to Sarge7
This might be helpful: Monitor your heart health on Apple Watch - Apple Support
How Afib is detected and reported will depend on the device and what country you are in.
User level: Level 10 (201,695 points)Sep 17, 2026 9:48 AM in response to Sarge7
Given that Apple has, to the best of my knowledge, not ever said exactly how often it checks, that would be hard to tell. I also haven't seen anything where Apple has commented on it.
Originally posted at discussions.apple.com/thread/256359096