Apple Watch Series 6: SpO2 tracking is cool, but it won’t test for COVID-19

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  • SpO2 knowledge is difficult to interpret
  • Nonetheless requires day by day cost with sleep monitoring and at all times on show

The Apple Watch Sequence 6 feels prefer it has perfected most of the options I appreciated about its predecessor. It has a brighter always-on show, a extra highly effective processor, sooner charging and two new colourful choices to select from. However the function I used to be most excited to check out was its new sensor that measures oxygen saturation within the blood (aka SpO2) with the faucet of a display screen. As somebody who panic-bought a pulse oximeter at first of the coronavirus pandemic and nonetheless checks her ranges on the first signal of a cough, the considered having one strapped to my wrist always was sufficient to pique my curiosity.

However not like the ECG function on the Apple Watch, which has been tried, examined and cleared by the US Meals and Drug Administration, together with the irregular coronary heart rhythm notifications, SpO2 on the Apple Watch nonetheless appears to be in its early phases. Navigating all this new knowledge could be daunting for anybody who’s not a medical skilled. 

SpO2 leaves some unanswered questions

I purchased an FDA-cleared pulse oximeter, the machine medical doctors use to measure SpO2 in your fingertip, as a precaution when coronavirus instances within the US began to climb. Having low blood oxygen ranges would not assure you’ve COVID-19, however it’s one of many main signs of the illness. I had learn horror tales of people that waited too lengthy to go to the hospital and had died of their sleep as a result of they did not understand their ranges had dipped in a single day. You need to at all times examine with a doctor if you’re experiencing shortness of breath (one other symptom of COVID-19), even when a pulse oximeter says you are in a wholesome vary, however I discovered consolation in realizing that I might at the very least use it as a reference if I ever skilled shortness of breath. 

That is not one thing you are able to do with the Apple Watch — Apple says it needs to be used for wellness functions solely and never as a medical machine, which means you will must take the outcomes with a grain of salt and should not use it to display screen for any sort of illness, which is what I had been hoping to get out of it. However there could also be different benefits of getting it strapped in your wrist always. 

Very like a pulse oximeter, the Sequence 6 makes use of crimson and infrared mild from its new sensor to find out the share of oxygen within the blood. However as an alternative of shining the sunshine by means of your fingertip, it makes use of the sunshine that is mirrored again from the blood vessels in your wrist to find out your oxygen ranges primarily based on the colour of your blood. 

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Throughout the setup course of you are requested whether or not or not you wish to activate SpO2 monitoring, which I did, however you may at all times return and disable it within the settings after the very fact. The very first thing I did after strapping on the Watch was open the Blood Oxygen app. It offers you a number of tips about how one can get the perfect outcome and that you must relaxation your arm on a desk or flat floor whereas the Watch is taking a studying. Then the 15-second countdown begins and also you’re achieved — simple and painless. I received a 95% on my first learn, which was decrease than what I am used to from my pulse oximeter. Something above 90% is usually thought of by clinicians to be inside a wholesome vary, however generally, greater is best.

I examined it a number of extra instances and received barely totally different outcomes inside a number of proportion factors relying on whether or not I used to be fully nonetheless and silent in the course of the take a look at, the place I had the watch positioned on my wrist and the way tight the strap was. There are numerous elements that may have an effect on a studying, equivalent to pores and skin temperature or the place of the sensors on the physique. Aspect-by-side with my pulse oximeter, the Apple Watch was usually off by about one or two factors, however generally spot on.  

Measuring blood oxygen ranges over time

What was extra fascinating to me was the SpO2 knowledge that collected over time within the Health app. That is one thing my pulse oximeter cannot do. In contrast to the Galaxy Watch 3, which solely does spot checks, the Apple Watch additionally takes background measurements all through the day (and evening). Click on on the Respiratory choice on the dashboard and you will see all of your measurements plotted on a graph which you’ll be able to view a day, week or month at a time and filter by time of day or proportion. But it surely’s as much as you, or ideally your doctor, to interpret this knowledge. 


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I have been carrying the Apple Look ahead to six days and I usually fluctuate between 95% and 100%. My stage is normally on the decrease finish of that vary in the course of the evening as your respiratory price is lowered considerably. However there have been two nights or early mornings the place my ranges dropped to 92%, which scared me a bit. I used to be beneath what the Mayo Clinic considers a “wholesome vary,” however above what’s thought of a “low vary.” Ought to I be involved? Dips in oxygen saturation can sign something from sleep associated circumstances like sleep apnea to bronchial asthma, and even respiratory viruses like COVID-19, however I do not know precisely how low and the way usually it has to occur for it to be an issue, and the Apple Watch cannot reply that. I want the watch might let me know if one thing was off, the way in which it does with the low, excessive or irregular coronary heart rhythm alerts so I might lastly put my little pulse oximeter to relaxation. Perhaps sooner or later, and with sufficient knowledge and medical research, it would.

Apple at the moment has three totally different SpO2-related research underway, together with one associated to bronchial asthma and one other for detecting early indicators of respiratory diseases equivalent to COVID-19.

With the Sequence 5 discontinued, the Sequence 6 can also be the one watch you may get from Apple with the electrocardiogram feature, which Apple calls ECG, that debuted on the Sequence four in 2018.

New colours, brighter display screen

Apart from the sensors on the again, the Apple Watch Sequence 6 might move for a Sequence 5. They’ve the identical physique and related always-on show. It wasn’t till I put them aspect by aspect that I observed a distinction. Whereas the display screen on the Sequence 5 dims when not in use, the Sequence 6 nearly appears prefer it’s nonetheless on, which is very useful if you’re outdoor. Apple says it is 2.5 instances brighter and it exhibits.  

It is also the primary Apple Watch so as to add to the standard silver, house grey and gold finishes. Mine got here in a Product Pink aluminum body. That aluminum model additionally is available in blue, whereas the chrome steel will get a brand new gold end. 

I just like the crimson, however I feel I might nonetheless follow a extra impartial tone for the body and spice it up with a watch band as an alternative. 

Claspless bands and Memoji watch faces 

Apple additionally introduced a brand new sort of silicone band with no clasps or buckles referred to as the Solo Loop

It appears and feels much like the silicone sports activities band, however with no overlapping components. I arrange my watch with a black dimension four strap that Apple offered and simply slipped in on my wrist like a hair tie. The fabric feels stretchy and barely easy to the contact. I believed it felt a bit tight at first, however I barely felt it on my wrist after a number of hours. It is very important get your dimension proper although, as a result of the dimensions down for me would’ve been method too small. 

This may require you to measure your wrist before you purchase it. And for this you will want a measuring tape, which I personally do not at all times have readily available. It is also costly for a band that I might fear would stretch a bit over time. It is $49 by itself, the identical value because the silicone sports activities bands. 


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I will must report again on the stretching as soon as I’ve used it for some time. I do assume it might be different for youths, which Apple is now focusing on with its new Household Setup, as a result of it is much less cumbersome to placed on and take off.  

The brand new Household Setup function permits you to arrange a second Apple Watch that does not want its personal iPhone. You’ll be able to program location alerts from the mother or father’s iPhone, designate which contacts they will talk with and restrict use throughout sure hours with the Faculty Time mode.

There are additionally new methods to customise the watch face with a brand new Animoji and Memoji which you can create instantly on the watch, which I did. I do not know the way lengthy I will maintain it on as my principal display screen, however I can see this being in style with children too. 

Sooner processor, however solely barely higher battery 

The opposite key improve to the Apple Watch Sequence 6 is the sooner processor: Apple’s S6 chip is predicated on the A13 Bionic chip discovered within the iPhone 11 and 11 Professional. The Watch feels snappy loading apps, displaying messages and exhibiting stats in actual time. However the Sequence 5 already felt quick, and thus far I have not observed an enormous change in my day-to-day use. The Sequence 6 can also be the one Apple Watch to incorporate Apple’s new U1 chip for ultrawideband assist, which improves spatial consciousness between units. The advantages of this new U1 chip might not be apparent instantly, however ultimately will allow options equivalent to CarKey, which lets you use your machine as a key fob.

I additionally have not observed a lot of a change in battery life in comparison with the Sequence 5, which is disappointing — now the Apple Watch can monitor your sleep, you will wish to use it 24/7. The silver lining is that it is now higher at managing battery life throughout sure exercises and it exceeded Apple’s 18-hour declare in my testing. 


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The Sequence 6 can last as long as seven hours on a single cost throughout an out of doors run, up from six hours on the Sequence 5. Although I’ve not examined this out for myself but, I did discover that the Sequence 6 had extra battery left after a 30-minute out of doors jog in comparison with my Sequence 5.

Even on the times I took it for a GPS-only run with out my cellphone in tow, I nonetheless ended the day with the 30% cost wanted to trace my sleep. I might even squeeze in a pair further hours within the early morning. You too can disable the always-on show in order for you much more battery, which isn’t an choice on any of the opposite fashions. 

The Apple Watch Sequence 6 and Apple Watch SE will cost to 100% in 90 minutes in comparison with the two-hour cost time of their predecessors, which helps velocity your day alongside. However generally my morning routine wasn’t lengthy sufficient for it to cost again as much as 100% and I ended up having to cost it in bursts all through the day, which might be onerous if you did not have a charger readily available. And also you higher hope you’ve a wall charger at residence, as a result of Apple is not together with them within the field anymore. You simply get the cable with the magnetic puck.

Bye, bye Power Contact on WatchOS 7 

The update to WatchOS 7 eradicated Power Contact on the Apple Watch throughout the board, so as an alternative of making use of extra strain on the watch face, you now must long-press to immediate an motion. You continue to get the identical haptic suggestions that you’d with Power Contact, however it did not appear fairly as satisfying. It additionally means you must relearn sure actions like switching from grid view to checklist view on your app display screen. In the event you lengthy press on the app web page, all of them begin to jiggle like on the iPhone to rearrange or delete. The checklist view choice has moved to the Settings. 

Actual-time elevation and cardio health alerts 

All the Apple Watch line may even get new health options with WatchOS 7, together with dance monitoring and core coaching, however solely the Sequence 6 and Apple Watch SE embody a brand new always-on altimeter that gives real-time elevation monitoring you should use throughout an out of doors exercise. 

The Apple Watch additionally makes use of the Vo2 max studying (most oxygen consumption throughout train) to observe cardio health ranges. It’ll ultimately let you understand when your ranges are too low with a brand new notification function that is launching later this 12 months. In keeping with Apple, this metric could be an essential indicator of total well being.


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Health Plus with the Apple Watch at its core

Apple’s new subscription Fitness Plus service brings guided exercises to the Apple Watch, iPhone, iPad and Apple TV. You’ll be able to select from quite a lot of totally different packages to stream in your machine of selection and sync with the Apple Watch. The Apple Watch will routinely begin the right exercise for you and show your stats on the display screen, so you may comply with alongside with out having to look at your cellphone. Instructors will use the Apple Watch as a coaching device to push you throughout a exercise. 

Sadly I wasn’t capable of take a look at this out on the watch but, as a result of it is not launching till later this 12 months. The Health Plus subscription will price $9.99 (£9.99, AU$14.99) a month, or $80 (£80, AU$120) a 12 months.

Nonetheless the perfect smartwatch, however with extra competitors 

The jury’s nonetheless out on whether or not blood oxygen monitoring turns into vital function, however with the Sequence 5 discontinued, it is now your solely choice in order for you that always-on show and ECG app. These are large promoting factors for the Sequence 6 and I personally would have a tough time going again to a display screen I needed to elevate to wake. The query now could be whether or not that is going to be sufficient to sway individuals to spend the additional $130 after they now have a compelling different within the Apple Watch SE, which shares most of the similar options for much less.  

Learn extra: Apple Fitness Plus vs. Peloton: Which streaming workout service is better?

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Vanessa Hand Orellana