Apple Watch series 6 blood oxygen monitoring
How often does apple watch record blood oxygen levels both during the day and at night while I sleep? And can this interval be changed?
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See the 'How to take a blood oxygen measurement' and 'About background measurements' sections of:
How to use the Blood Oxygen app on Apple Watch Series 6 - Apple Support
"The Blood Oxygen app on your Apple Watch will occasionally measure your blood oxygen levels if background measurements are on. This will usually happen when you are not moving. Depending on how active you are, the number of readings collected each day and the time between these readings will vary."