Understanding spirometer results

[Marciepaint]

I know my COPD is severe, but I think I put tremendous effort into every test, but the results vary so much.  A month ago my FEV1 was 38%.    Today, it was 47%, took albuteral and 10 minutes later was 32%.  I know some days are better than others, but how would an expert interpret this difference and I am very surprised it was worse after albuteral.

[David Tinkelman, M.D.]

If you do indeed have “severe COPD” as the 30% FEV1 range would suggest, the actual change in volume of the FEV1 is probably small but exaggerated by expressing it as a per cent.

I must agree, however, that a fall from 47% to 32% is a pretty large drop.  With that I would also be concerned about the accuracy of your measurement device.  You might want to ask your doctor’s staff to check this out.  Try not to be alarmed by numbers.  The important thing is how you feel and the ease with which you can breathe.

Good luck

[allmymarbles]

I am also classed as having severe COPD. I am not sure about this, but I have the impression that taking more albuterol than I need is irritating and can lower my FEV1. Had you taken albuterol shortly before taking it the second time?