I have an o2 ring. Shows the cycle of o2 fluctuations from 80-99 in pretty consistent 6 min cycles. Wearing my body out. Even during oxygen therapy the fluctuation occur but I can move more and do things longer without very low dips (below 80). My drs...dont even want to look at results from anything that is not done in office. I was lucky the first time I was seen that my o2 was fluctuating in the low 80's at the time they checked . The doctors just keep saying it doesn't make sense. Failed the 6 min walk but my pulm says my lungs are fine.