How to view results on an iPhone, compatible models, and how to monitor blood oxygen with an Apple Watch
Follow along to learn how to use the Apple Watch’s blood oxygen sensor, whether you’ve used it before or not. In addition, we’ll discuss which models support the functionality, the accuracy of the measurements, and other topics.
Supported models and reliability
With the release of the Series 6, Apple Watch acquired the capability to detect blood oxygen, and it has been a feature of every Apple Watch model since. That is, until Apple was compelled to remove the feature from the most recent Apple Watch models starting on January 18, 2024 due to a legal dispute with Masimo.
Apple begins selling Apple Watch Series 9 and Ultra 2 without the blood oxygen feature
Thankfully, blood oxygen capabilities will not be lost for those who acquired an Apple Watch 6-9 or Ultra/2 before January 18—more particularly, for those whose model number ends in “LW/A.” Check out our comprehensive explainer for additional details on that:
How to determine whether the blood oxygen capability is available on a Series 9 Apple Watch model
In terms of effectiveness, numerous tests have shown that the blood oxygen feature on the Apple Watch is just as dependable as “medical-grade” equipment.
How to check blood oxygen with Apple Watch
Look for the red and blue revolving circle icon on your Apple Watch (bought before January 18, 2024) or ask Siri to start “Blood Oxygen.”
During the measurement, keep your watch as still as possible and face up.
This is how a blood oxygen level readout from an Apple Watch works:
Advice on how to successfully take a blood oxygen level
Apple advises doing the following if you encounter a “unsuccessful measurement” error:
“Check that your watch is not worn too low.”
“The band on your watch should be snug but comfortable.”
“Aim to remain motionless and keep your watch facing up.”
“Using a table to rest your wrist can be helpful.”
Examine blood oxygen levels on an iPhone.
Launch the Health app on your iPhone.
In the lower right corner, select Browse.
Select Respiratory Blood Oxygen at the top by swiping down.
We appreciate you taking the time to read our blood oxygen level with Apple Watch tutorial.