My Apple Watch 7 isn’t taking periodic oxygen levels
My Apple Watch 7 stopped taking periodic oxygen levels. I’ve changed sleep and theater focus back and forth still doesn’t work
Question marked as
Blood oxygen measurements use a bright red light that shines against your wrist. See the figure in the 'Blood oxygen measurements use a bright red light that shines against your wrist' section in:
Monitor your heart rate with Apple Watch - Apple Support
Make sure those sensors are not obstructed. See:
How to clean your Apple Watch - Apple Support
The first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support