Apple I watch does not give accurate blood oxygen
My Apple I watch does not gIve accurate blood oxygen
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See the 'How to get the best results' section in:
How to use the Blood Oxygen app on Apple Watch - Apple Support
Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes. Even under ideal conditions, your Apple Watch may not be able to get a reliable blood oxygen measurement every time.