Apple Watch Pulse Oximetry Can Be Reactivated Through Software in 2028 or With Successful Appeal (2025)

by Juli Clover

Apple has been selling the Apple Watch Series 9 and Apple Watch Ultra 2 without the blood oxygen monitoring feature in the U.S. since mid-January, and while we've suspected Apple would be able to reintroduce pulse oximetry in models that lack it through a future software update, new information from the U.S. Customs and Border Protection (CBP) confirms that reactivation is indeed a possibility. As a recap, Apple was found to be infringing on patented pulse oximetry technology owned by Masimo, and was banned from importing the ‌Apple Watch Series 9‌ and Ultra 2 into the U.S.

Apple Watch Pulse Oximetry Can Be Reactivated Through Software in 2028 or With Successful Appeal (1)
The original January 12 order from CBP that allowed Apple to bring Apple Watch models with a disabled sensor in the United States was published recently (via ip fray), and it gives some insight into how Apple disabled pulse oximetry. While some of the order is redacted, Apple implemented a fix that turns off pulse oximetry when an Apple Watch is paired to an iPhone. Blood oxygen sensing becomes inaccessible to the user, and opening the blood oxygen app gives a warning that the feature is not available. Apple said that it hardcoded each Apple Watch at the factory with new software.

As part of the process to get approval to sell ‌Apple Watch Series 9‌ and Ultra 2 models without pulse oximetry enabled, Apple had to provide the code disabling the feature and test devices to Masimo. Masimo didn't want Apple to have such an easy fix, so it paired the "redesigned" Apple Watches with a jailbroken ‌iPhone‌ running an older version of iOS, and was able to get pulse oximetry working.

Masimo tried to argue that activating pulse oximetry through a jailbroken phone meant Apple had not effectively removed the feature and the devices should not be allowed to be imported in to the U.S. Masimo also tried to say that jailbreaking is "permissible, common, and readily known," but Masimo's arguments were unsuccessful. The Exclusion Order Enforcement Branch of the U.S. Customs and Border Patrol ultimately decided that disabling pulse oximetry in the ‌Apple Watch Series 9‌ and Ultra 2 was enough to avoid infringing on Masimo patents, allowing those models to be offered for sale at Apple retail stores in the U.S.

Because Masimo was able to get blood oxygen sensing working using software on a jailbroken ‌iPhone‌, Apple too would be able to reactivate the blood oxygen sensor in the models where it has been disabled through a software update. When no longer subject to an import ban, Apple will be able to reintroduce blood oxygen sensing for ‌Apple Watch Series 9‌ and ‌Apple Watch Ultra 2‌ users who are not able to access the feature.

As noted by ip fray, the patents that Apple was found to have infringed on expire in August of 2028, which means that Apple will be able to re-enable pulse oximetry in affected models at that time. Apple filed an appeal with the United States International Trade Commission to attempt to get the ruling overturned, so if the appeal is successful, Apple could be able to re-add blood oxygen sensing sooner.

Apple could also opt to settle with Masimo and work out a licensing deal, but at this point, it doesn't sound like that is going to happen. Masimo CEO Joe Kiani said in January that he had not spoken with Apple, and while he would be open to settling, an apology and an "honest dialogue" would need to be part of any settlement discussion.

Kiani has maligned the Apple Watch blood oxygen sensor several times, saying that customers are "better off without" the feature because it is not a "reliable, medical pulse oximeter."

The ‌Apple Watch Series 9‌ and Ultra 2 only have disabled blood oxygen sensing capabilities in the United States, as the ban is not applicable in other countries. The Apple Watches remain fully functional outside of the U.S.

Tags: Patent Lawsuits, Masimo

[ 202 comments ]

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Top Rated Comments

21 weeks ago


patent trolls are the worst

Masimo isn't a patent troll.

Score: 44 Votes (Like | Disagree)

TheLisnakFactor

21 weeks ago

I’m so confused. So these guys say you infringed on our patents and because of that made an unreliable sensor? Sounds like some stupid logic to me.

Score: 29 Votes (Like | Disagree)

MacDevil7334

21 weeks ago

Masimo’s licensing fee must be exorbitant because it really seems like it would be in Apple’s interest to settle at this point.

Score: 27 Votes (Like | Disagree)

CrysisDeu

21 weeks ago

So basically not gonna happen before your series 9 becomes legacy product

Score: 24 Votes (Like | Disagree)

kc9hzn

21 weeks ago


Masimo isn't a patent troll.

Yes and no. While they do have products on the market (which means that they don’t qualify under the traditional definition of patent troll), when you look at their complaint, it looks like they’re trying to enforce a patent (an expired one, I might add) on the very idea of a pulse oximeter. Overly broad patents held by a firm with significant market power in captured markets (the highly regulated market for professional grade pulse oximeters, ie for hospitals and the like) weaponizing patents against would be competitors in the consumer space would probably qualify as a patent troll in most people’s eyes.

Masimo claims that Apple wouldn’t have been able to bring the sensor to market without having poached employees, though Masimo doesn’t actually seem to be pursuing any legal action on those grounds or corporate espionage grounds, only the patent grounds. (Also, in California, non-compete and anti-poaching clauses are unenforceable, and both companies are based in California.) Masimo also happens to be a very well connected business politically (good ol’ regulatory capture, no doubt), so, while Apple has a substantially bigger market cap than Masimo, this is hardly David vs Goliath. It’s more like, for lack of a better analogy, Goliath vs Achilles.

Score: 23 Votes (Like | Disagree)

Apollo68

21 weeks ago

For anyone who doesn't seem to understand what a patent troll is, here is a brief primer. A Non-producing entity, known colloquially as a patent troll, is an individual or business entity that holds onto an intellectual proprerty portfolio with the intentions of using them to profit through litigation. They have no intention of actually commercializing anything in their portfolio. Masimo does actually bring devices using the patent in question to market. You cannot just call a company a patent troll in good faith because they are asserting their IP rights.

Score: 13 Votes (Like | Disagree)

Read All Comments

Apple Watch Pulse Oximetry Can Be Reactivated Through Software in 2028 or With Successful Appeal (2025)

FAQs

Apple Watch Pulse Oximetry Can Be Reactivated Through Software in 2028 or With Successful Appeal? ›

Apple controls its walled garden and can simply ship a pulse oximetry activation app after a successful appeal or in late August 2028. Masimo's engineers had to use older iPhones and jailbreak them. Apple doesn't face such restrictions. It has a prerogative.

Will the Apple Watch get the oxygen sensor back? ›

When no longer subject to an import ban, Apple will be able to reintroduce blood oxygen sensing for ‌Apple Watch Series 9‌ and ‌Apple Watch Ultra 2‌ users who are not able to access the feature.

Does the Apple Watch have a pulse oximeter? ›

The Blood Oxygen app on Apple Watch is an accurate wrist-based pulse oximeter capable of both on-demand and background measurements. The data is available in the Health app on iPhone, allowing users to track values and trends.

Is the Apple Watch oximeter FDA approved? ›

The features on the Apple Watch that track heart rate and heart rhythm, though, have a key difference from the blood oxygen monitor: the heart-tracking features are cleared by the Food and Drug Administration (FDA), and the oxygen monitor is not.

Does the Apple Watch Series 9 have an oxygen sensor? ›

When Apple was forced by a court to disable the blood oxygen sensor on all Apple Watch Series 9 and Apple Watch Ultra 2 models following a patent dispute, the media made a pretty big deal out of it. In reality, however, it doesn't seem like end users think it's a big deal at all.

Will Apple get pulse ox back? ›

While the ability to reactivate pulse oximetry on a jailbroken iPhone suggests that Apple could re-enable the feature through a software update, the company may have to wait until the relevant patents expire in August 2028.

How do I reinstall blood oxygen on my Apple Watch? ›

The Blood Oxygen app is installed during the setup in the Health app. If you deleted the Blood Oxygen app, you can install it again from the App Store on your Apple Watch if you've completed the Blood Oxygen app setup.

Why is Apple removing the blood oxygen sensor from the watch? ›

The decision to turn off the blood-oxygen sensor for consumers who buy either the Apple Watch Series 9 or Ultra 2 in the U.S. came after a federal appeals court on Wednesday refused to extend an order that had allowed the watches to remain in stores during a battle over the rights to some of the technology.

Will Apple disable the oxygen sensor on existing watches? ›

Those who have already purchased the Series 9 and Ultra 2 models in the U.S. will still be able to use the blood-oxygen sensor as they have been. The sensor will continue to work on those watches purchased outside the U.S.

Is SpO2 being removed from Apple Watch? ›

The ability to measure blood oxygen is no longer available on Apple Watch units sold by Apple in the United States beginning January 18, 2024.

How accurate is US blood oxygen on Apple Watch? ›

While only one measurement using a conventional pulse oximeter resulted in a value below 95%, there were eleven (14%) Apple Watch measurements below 95%, including two that measured a spO2 of 92% (Fig. 1).

What smartwatch has SpO2 FDA approved? ›

Introducing the first and only FDA-cleared medical wearable to provide continuous, real-time, oxygen saturation (SpO2) and pulse rate (PR). Now with the Masimo W1 Medical Wearable you can: Accurately track your health data with a medical grade sensor in an easy-to-interpret format.

Do iPhones have pulse oximeter? ›

No. A pulse oximeter requires the comparison of readings from *two wavelengths of light to arrive at an oxygen saturation measurement. iPhones have only one, and results from apps claiming to accurately determine this should not be trusted.

Which Apple Watch has a pulse oximeter? ›

Use the Blood Oxygen app on Apple Watch Series 6 or later to measure the percentage of oxygen your red blood cells carry from your lungs to the rest of the body.

How to activate blood oxygen on Apple Watch? ›

Enable / Disable Background Measurements
  1. On the connected iPhone, open the. Health app. ...
  2. Tap the. Browse tab. ...
  3. Navigate: Respiratory. ...
  4. Enable. then follow the on-screen instructions.
  5. From the Watch face screen, press the. Digital Crown. ...
  6. Tap the. Settings icon. ...
  7. Blood Oxygen. .
  8. Tap any of the following to turn on or off: In Sleep Mode.

How to tell if an Apple Watch has an oxygen sensor? ›

The way to find out if the Apple Watch you are buying has blood oxygen feature disabled or not is by checking the part number. Apple says that new watches with blood oxygen disabled have part numbers that end with the string 'LW/A'. You can see this part number on the label of the Apple Watch box.

Does the Apple Watch 8 still have an oxygen sensor? ›

Note: Blood Oxygen app measurements are not intended for medical use. The ability to measure blood oxygen is no longer available on Apple Watch units sold by Apple in the United States on or after January 18, 2024.

Does the Apple Watch Ultra 2 have the blood oxygen sensor? ›

You'll remember, but just in case, Apple was accused of patent infringement by health device maker Masimo for the way pulse oximetry (measurement of blood oxygen) worked on the Apple Watch. The monitoring feature was then removed from all Apple Watch Series 9 and Apple Watch Ultra 2 devices sold in the U.S. by Apple.

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