Why is it no available
Why is blood oxygen not available on my Apple Watch 6s
Apple Watch Series 6
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You do not mention where you are located. Please check this link, then scroll down to Health: Blood Oxygen App to see if this feature is available in your region.
If it is available for your region, then please check the instructions here:
How to use the Blood Oxygen app on Apple Watch - Apple Support
If this does not help, please let us know. Include which iPhone you are using, the iPhone’s iOS, the OS of your Apple Watch and any error messages. We want to help if we can.