O2 levels and having O2 on hand

[iefisherman]

I was wondering about people that have O2 on hand and thier levels. My head nurse recomended it a few times and after a few bad days I e-mailed her to get the ball rolling. What numbers were you guys at before you had O2 in the house? I don't plan on using it much but i think it would be good to have just in case.
thanks,
Ben

 

[Jane]

Jesse's doc just told us that you should have O2 at home if your sats drop below 90 while you are sleeping.