Hello. My oxymeter readings always seemed to low - between 89 and 91. I started to use medical-grade oxymeter and I actually have SPO2 between 97 and 99. I see this as problem because in SPO2 the most important range is 85-100, so if the reading is off by 8%, it is actually 50% error. That is not acceptable.
Jan
For istance, if your real Spo2 is %100, Garmin will show as %95-%96 already. So, please try on a healthier person with Spo2 value of +%98 and share here. I'm sure that you will see %96 or below…
Look, we're going around in circles here so this is my last post on this subject.
You have come to a support forum, not a general forum. People who frequent these forums are generally those that are…
Some people get realistic results comparable to a medical grade device others do not. With the F6 and other non-medical grade devices that estimate blood oxygen saturation from reflected light it's best…
The problem is that you don't know if other equipment gets you GOOD value, for example they can return previous value if they have problem. Everything depend of developer who can write any code and we all believe in this data 
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Today I made 2 tests, one on Samsung s10 using Samsung health app it reads data from finger (reflect way like Garmin do the same from wirst) and Garmin.
1. The process is long I think it's not simple reading one value it's connected with observation volatility of pulse and another parameters (and must be silent, no movement etc).
2. Samsung showed 89%, Garmin 92%.
So, which value is good? Should I have believe Samsung or Garmin?
The less problem is with HR, you can check it more or less because your body give you a signal of high/low HR.
But Sp02 is difficult to check if it's between 90-100 and it depends of altitude.
https://www.webmd.com/asthma/guide/hypoxia-hypoxemia
But off course I'd like to have a device that give me correct values and believe that all manufacturers test their equipment none of them would not dare to install something without tests.
The big problem is if someone needs accurate data (e.g. sick) but I think they have to use medical equipment. I don't think the watch is a good device for them - the right device for the right application.
So, since we are talking about Garmin, you need to define - who this device is for and what the requirements for this device should be. We do not require a passenger car to carry 10 tons.
1. Ones like Samsung another Huawei
2. I wrote that Samsung and Garmin showed almost the same I don't have now Huawei but tomorrow I'll check it on Huawei and others - but which tells the truth ?
And I'd like Garmin, Samsung, Apple, Huawei and all others have the best solution for us all even to include in consumer products medical features but, simple, it's rather impossible. Each product is directed to specified market and only solution is not believe into marketing materials but check it thoroughly before purchase.
Comparing against a smartphone, other watches or pulse oximeters from Amazon or Ebay is not a wise idea as they are not medical grade devices and have their own limitations…and even if they do meet the criteria, they need to be calibrated yearly to keep that certification.
I happen to have 2x real medical grade devices with me right now, both calibrated. As you can see, my Tactix Delta reads exactly the same as a CorPuls3 and a Lifepak 15. To claim that ”the Fenix 6 line have useless pulse oximeter readings” is clearly hyperbole.
