referral for CFTR

Afternoon all, had a bit of a bombshell today, after a persistant cough for 18 months which is productive I've been sent for CFTR test. Is this normal in a 27yo female? Chronic autoimmune issues for 25 years plus so not new to Drs. Can an anyone offer words of wisdom or similar?!
Source: Cystic Fibrosis DNA and Mutations Forum - Category: Respiratory Medicine Authors: Tags: DNA and Mutations Source Type: forums