Will blood oxygen app work on Apple Watch series 8?

Hello kdenton1880,

Yes, it should work. You can verify this by checking the Serial number; if there are the characters: "LW/A" placed together somewhere within the number, then the Blood Oxygen app is disabled. However, as far as I know, this is only affecting some Apple Watch Series 9 and Ultra 2 models.

How to use the Blood Oxygen app on Apple Watch - Apple Support

Let me know if you have any other questions.

Have a nice day.

It depends. If your Watch was sold by Apple in the United States on or after January 18th, 2024, you will not have the blood oxygen feature. These are indicated with part numbers ending in LW/A.

Learn more ⇢ How to use the Blood Oxygen app on Apple Watch - Apple Support