my dad is at stage 4 copd with 16% lung capacity. Had a flair up 3 years ago which put him in hospital for bout a week and rehab home for bout 3 weeks. This past year he had flair up in September with bout a week in hospital then 2 weeks rehab home. Less than a month home back in hospital for 12 days but in rehab home almost 8 weeks but they say he's ready to go home. 

My concern is these two most recent flair ups and his low lung function. He is on oxygen 24/7 set at number 2 even though he came in on oxygen as needed and on number 1. I'm afraid there will be another flair up or will get sick again. And honestly don't know if he could survive another flair up. 

Any thought or comments from your experiences are greatly appreciated