<div class="FTQUOTE"><begin quote><i>Originally posted by: <b>Emily65Roses</b></i>
I don't know quite how it works either... except that small airways always go first. And I also don't know how they measure it, but the FEF 25%-50% is your small airways.</end quote></div>
Small airways are a much more sensitive indicator of health for those who have mild CF (objectively measured by FEV1 of greater than 70%).
You notice small changes of infection/damage in small airways. once the small airways have gone, larger airways go after.
so for someone like Em, just like she said, a more sensitive measure of her health is her small airways. <img src="i/expressions/face-icon-small-smile.gif" border="0">