Right thanks that is a detail I did not add but mostly I was talking about overuse in the ER when you are lying there on a stretcher! I was not aware that you should likely not go above 95 on supplemental o2 too much and that 88 is not so bad if you have COPD because you could end up with too much of co2 or o2 or something if you go over the 95 . I am still not too clear on this. I thought 99 on 02 was good and that turns out to be wrong for copd people it seems. I am in hospital now and I monitor it myself with my pulse ox thing and haven't needed any 02 at all because always in the 91-94 range resting or moving and middle of night when nurse checks