As a person who has COPD, I’ve become an expert on this. The bottom line is if you’re above 95-all is good. between 90 and 95% you’re starting to have a problem, anything less than 90 you got to see a pulmonologist/doctor. You’re not getting enough oxygen to your tissues. It can lead to huge problems down the road, also if you’re waking up with a headache or fatigued, that’s another symptom of what they call oxygen starvation or hypoxia.
Take a few deep breath’s before you run the test, and you’ll get a higher score, a few deep breath’s are acceptable according to my pulmonologist. Because it shows you still have the ability to process oxygen.