I think it depends on wether you have a 'trigger gene', and I think the delta F508 is one, I appear not to have a trigger gene. I go to the hospital for a CT scan on my lungs an d breathing/lung function tests on the 11th of May, and I go back to the adult CF centre doctor on the 26th of May to find out whats what. DS's nurse comes in the morn I will ask her if she can find out my gene numbers for me as I have mislaid them. I will post about this after the 26th.