Copd Oxygen Saturation COPD, What Will 02 Saturation Be At Sea Level?

COPD, what will 02 saturation be at sea level? - copd oxygen saturation

My husband has COPD. The O2 saturation is 87% - 89% during the night without his oxygen. live in Colorado (alt 5000 m). we go to sea must then sleep with oxygen? I'm looking for people who have COPD, and is already changing experiences in height.