Apple finally reintroduced the Blood Oxygen feature for Apple Watch models in the U.S. this week - here's how to use the app.

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Apple will introduce a redesigned blood oxygen feature for some Apple Watch Series 9, Series 10, and Apple Watch Ultra 2 users through an iPhone and Apple Watch software update.

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The smartwatch's Blood Oxygen app lets you measure the oxygen level of your blood on-demand. It's been MIA for more than a year thanks to a patent spat, but it's back in action now.