For the first time ever I was hospitalized with COPD flare up in January for 5 days. I came home on O2 at first 24/7 but after a week and the walk test I am only using 2 liters during activity. I go back to the doctor March 2nd. My resting O2 is 96 or so. Do most people have to stay on it, or is it possible to be taken off oxygen after a while?