Apple Watch users in the US have been unable to access the blood oxygen feature. Here’s when it might make a comeback.

Blood oxygen monitoring is getting less and less likely on the Apple Watch Series 11, according to a new Apple rumor.

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Like most modern wrist wearables, that ECG sensor uses LED lights to monitor your heart rate and pulse transit time (PTT). The rear PPG passively determines blood oxygen levels as well.

More recently, they've used the Smart Sock 2 to monitor their child's heart rate and blood oxygen level and receive notifications in the event of potentially dangerous changes. If you're ...