Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Cystic Fibrosis ?
    ### Response:
    Doctors diagnose cystic fibrosis (CF) based on the results from various tests.
                
Newborn Screening
                
All States screen newborns for CF using a genetic test or a blood test. The genetic test shows whether a newborn has faulty CFTR genes.
    