Hi lesley and thanks for this post. You may be aware we cannot provide medical advice or diagnostics over the internet (for your own safety), but your concern certainly warrants a reply. I am presuming you have been diagnosed with COPD and also that you are using physician-prescribed supplemental oxygen therapy. In the most general of terms, providing oxygen to a person will almost always increase their oxygen saturation. You would probably do best to ask your question to your diagnosing/prescribing physician. There can be any number of answers as to why your oxygen saturation has gone up when previously this did not occur. Please do check back and let us know how you're doing. Good luck! Leon (site moderator)