Posted by John O. on 7/24/2008, 10:33 pm, in reply to "Re: FEV1s throughout the years."
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The "Ref 2.01" on your report is the amount of air, in liters, that an average person of your age, size and height would exhale in the first second of the test. So the .67 you scored on 4/21 was about 1/3 of that, or 34%. There are different scales used to determine the percentage, as this site lists:
http://www.medal.org/visitor/www%5CActive%5Cch8%5Cch8.01%5Cch8.01.01.aspx
The confusion between the different methods causes some people to fall back on the liters as a better way to look at it. Obviously a given liter amount is going to be the same no matter what calculations are used to figure the percentage.
If all the standards are equally reliable (and FEV1 was the only thing determining how well we function, which it isn't) then since we have the same percentage we should be doing equally well. How I'm doing is: active, O2 more or less 24/7 at 3 to 4 liters for most activity, five hospitalizations in the past 6 years (but only one in the last 2 1/2 years), 4 or 5 other exacerbations in 6 years (requiring antibiotics and prednisone).
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