I don't understand how my oxygen level can be so good and yet, I'm having a hard time breathing just walking from the living room to the bathroom in a small house.
This article might help a little https://copd.net/answers/expert-answers-what-is-spirometry but basically, even if your PulseOX is great, the volume of air you can take into your lungs also plays a part in that. It is a multi-factor thing. let us know if there's anything more we can do to help! Keep on keepin' on, DPM