I know a lot of you have an asthma component to your CF. How do you make decisions about when to do IV's based on your FEV1. I am kind of new to the whole IV process. My FEV1 seems to fluctuate by about 5-8% points in both directions. For example, a few weeks ago I was down about 8% and wanted to immediately start IV's or something; but, doc wanted to watch them cuz he was not too sure that they wouldn't be back up. Sure enough in a couple of weeks they were back up. Last time I went to the docs office.....down again and accompanied with a bit of a wheeze. I have no other symptoms when this happens (extra sputum, fever, crackling in chest). I guess my question is at what point do you attribute a decline to blowing technique, weather, asthma symptoms. I am fine with doing IV's......I just want to do them at the right time. I have a clinic appt. on Monday. Maybe my best way to monitor FEV1 is looking at a consistant trend down for a couple of visits. Thanks for any help<img src="i/expressions/face-icon-small-smile.gif" border="0">