Nothing coming up!

Is there anyone out there like this or is it just me! I'm not very productive at all! I bring tiny amounts up a day even after physio etc and I'm not sure weather this is good or bad and my lung functions around 55-58% so somethings wrong somewhere. My doctor always asks if I bring a tablespoon or teaspoon up but It's more like the size of a thumbnail I bring up a day!
Source: Cystic Fibrosis Airway Clearance Techniques Forum - Category: Respiratory Medicine Authors: Tags: Airway Clearance Techniques Source Type: forums