Why Apple Didn't Need FDA Approval for the Blood Oxygen Tracking Feature in the Apple Watch Series 6

Prior to releasing ECG functionality in the Apple Watch Series 4, Apple needed FDA approval for the feature, but the same isn't true of Blood Oxygen monitoring in the Apple Watch Series 6 because Apple doesn't see it as a medical feature.

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As outlined by The Verge, pulse oximeters like the blood oxygen tracking feature in the Apple Watch are considered Class II Medical devices and documentation is generally required, but there's a way around that. If a pulse oximeter is marketed as being for general wellness or fun rather than for a medical purpose, FDA documentation is not required.

That's the reason why the blood oxygen tracking feature is not being marketed by Apple as a medical feature, and an Apple Support document clearly states that measurements taken using blood oxygen tracking are "not intended for medical use" and are designed for "general fitness and wellness purposes."

The Apple Watch Series 6 Blood Oxygen app provides no insight into blood oxygen readings, nor does it send alerts when a lower than normal blood oxygen level is detected, because that would be a medical feature.

Apple is prohibited from using the blood oxygen tracking feature from impacting the medical care that someone receives, which is a deviation from how the ECG functionality works. ECG readings from the watch are used to alert users of an abnormal heart rhythm (atrial fibrillation) and thus required greater oversight. Apple was required to provide the FDA with data proving that the feature can detect atrial fibrillation, which could be examined by experts.

Avoiding regulatory approval in the United States and in other countries permitted Apple to launch the blood oxygen feature in more than 100 countries. ECG availability is still limited because it requires medical approval in each country it launches in.

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Michael Matheny, co-director of the Center for Improving the Public's Health through Informatics at Vanderbilt University, told The Verge that when he went to find data on how well the pulse oximeter in the Apple Watch works, there wasn't much out there. "It was concerning to me," he said.

It's also potentially confusing to customers because Apple's marketing is sometimes unclear. "Patients and consumers don't really understand the difference," said Matheny. "So they'll start using the device and relying on the information."

There have been multiple reports from Apple Watch Series 6 owners suggesting the blood oxygen tracking feature isn't particularly accurate when compared to a finger worn pulse oximeter, with successive readings that can be all over the place.

We here at MacRumors have also noticed problems with unusual readings that don't seem to be right and that are suggestive of breathing problems when there are none, which is potentially problematic and could lead to panic over nothing. The feature can also be hard to use, requiring little arm movement with results potentially impacted by cold weather, tattoos, and other factors. Some users have no problem, though, and all Apple Watch Series 6 owners should remember that blood oxygen tracking isn't a medical feature and should not be relied on as a measurement of health, even if it may have some utility as an alert in an emergency situation.

Related Roundup: Apple Watch Series 8
Buyer's Guide: Apple Watch (Neutral)
Related Forum: Apple Watch

Top Rated Comments

Apple_Robert Avatar
31 months ago
Apple was smart to do this. Maybe down the line they will see FDA approval.

I compared my watch pulse ox to a medical fda proved device yesterday, and each time, there was only a 1% differential between the watch and the device.
Score: 14 Votes (Like | Disagree)
terraphantm Avatar
31 months ago

The ECG app doesn't diagnose heart attacks, per all the warnings that show up when you start using it. But the health apps, and the information they provide, are a good way to keep track of your personal "normal" and get a warning if something begins to go haywire.
The ECG physically can't diagnose heart attacks because you're not getting a full picture. Take a look at this 12-lead of a STEMI



This guy is having an anterior and probably inferior STEMI based on leads V1-V5 as well is II/III/AVF. But lead I, which is equivalent to the lead your Apple watch checks, is pretty much normal. The Apple watch would have totally missed it, which is why they warn you every time that it cannot diagnose a heart attack.

It is useful for detecting afib, since that shows up in all leads. And it could probably also be useful for detecting things like heart block or QT prolongation and various other arrhythmias, but Apple decided to focus on afib.
Score: 13 Votes (Like | Disagree)
randolorian Avatar
31 months ago
The worst part of reading an article about Apple Watch is being subjected to the unflattering close-up photos of peoples' hairy arms. ;-).
Score: 12 Votes (Like | Disagree)
derTeHa Avatar
31 months ago
Prior to releasing ECG functionality in the Apple Watch Series 5
ECG was available since Apple Watch Series 4.
Score: 12 Votes (Like | Disagree)
JRobinsonJr Avatar
31 months ago
It doesn't have to be 100% accurate, but absolutely should/must be consistent. Doesn't matter what my 'normal' is as long as I can trust the deviation number. Sounds like the Watch version is neither accurate NOR consistent. So... why bother?
Score: 10 Votes (Like | Disagree)
Killbill2 Avatar
31 months ago
Mine has been accurate, 1% variability plus it tracks at intervals through out the day without me walking around with a big ass hunk of electronics on my finger tip. I used my Masimo ($200-$300) not a $20 amazon meter, the watch seems to be very stable when using manual measures. I'd have to leave the Masimo on and pull the data from both to do a comparison on the auto measurements... but I'm feeling lazy maybe another day I'll do that another day.

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Score: 9 Votes (Like | Disagree)

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