Screen shot of why the Garmin Pulse Ox can't be trusted

[Stom]

I got a Garmin vívosmart 4 for sleep tracking. It also will record 4 hours of Pulse Ox readings per night, one minute apart, and I've always been a little suspicious of them, but this is ridiculous. The line in the time/SPO2 graph in this screen capture goes back and forth instead of one direction only. A pulse ox graph should not look like a cursive signature :-O

   

So, clearly there is a bug.

But I have to say, it's still really hard to completely ignore the other readings that are frequently between 80 and 90% and are at odds with the readings from my sleep study.

Is it worth it to buy a dedicated pulse ox to test whether or not the Garmin is totally wrong, or should I just ignore it completely since there is pretty strong evidence it is un-reliable?

[Sleeprider]

It's a Garmin!

If you've used GPS or personal fitness devices, you would be used to glitches. I have owned many Garmin devices over the years. They build hardware and don't support it with good software or firmware. JHMO.

[SarcasticDave94]

Nice signature on the screenshot.

IMO maybe Garmin should stick with GPS devices. They'd be able to find their corporate direction by rethinking things a bit.

[idlewire]

I like how the chart crosses back into the past. According to this, there were multiple times throughout the night where you had two different yet simultaneous readings! Sometimes three! Oy