There are pages you can get via google that will help you work out your fev1 versus the other thing. The basic % number is what they use to decide which stage you are at. Hope this helps. This is one I just got via google :) http://www.worker-health.org/breathingtestresul...

Here are three web sites that will help you:

http://www.gp-training.net/protocol/respiratory...

http://jan.ucc.nau.edu/~daa/lecture/pft.htm

http://noairtogo.tripod.com/pft.htm

Jean

@MarianneKitsonwhere do i read the response to Spirometer reading meaning? I would like to see also. ty