what I have learned about copd is the first thing you need to do is see a respiratory dr. As far as oxygen & stages go, I have been totally oxygen dependant for about 1 yr now. I am end stages, my level with an oxometer depends on if I'm doing anything or not. If I'm watching tv it's about 96-99. Moving around it can go as low as 40's. I am also at a 3 which is where I started..believe it or not I still worked 40 hours a week as a housekeeper at the hospital until about a year ago w/o the oxygen. I quit when I always had to lean on something all the time
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