On the day of the launch, AppleWatch unsurprisingly disguised the famous website iFixit. They had an amazing discovery: AppleWatch hardware includes a “pulse oximeter” for measuring blood oxygen levels, but I don’t know why. Apple did not mention this feature in the final release of AppleWatch.

Generally speaking, smart watches on the market measure the wearer's heartbeat using an optical heart rate monitor, while Apple integrates a more powerful pulse oximeter in AppleWatch. No wonder Apple has claimed that the heart rate detection function of its own watch is more accurate than the competition.

As for why AppleWatch did not integrate the blood oxygen measurement function, iFixit speculated that the reason may be that Apple found that its accuracy could not meet its own requirements; it may also be required by the US Food and Drug Administration (FDA) for AppleWatch. The pulse oximeter was further studied and was not licensed for the time being.

If AppleWatch can support blood oxygenation testing, it can better help you understand the impact of high altitude on your body; it also has a positive effect on asthma patients or athletes. More importantly, it can further improve the Apple Health Application System and provide a more convenient measurement of blood oxygen content for medical personnel using ResearchKit.

Apple does not rule out the possibility of AppleWatch supporting blood oxygen content measurement through software updates later, so if you have a need in this area, you may wish to continue to pay attention.

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