Lung Function

I am seeing so many people post about their lung function. I see that some people have a lung function of 125%. Others say they have almost perfect function at 97%. Does anyone have any information on how this works? My son in law has a lung function of 71 and is 21 years old. How does that relate to non cf lung function? Thanks for your help!
Source: Cystic Fibrosis Adults Forum - Category: Respiratory Medicine Authors: Tags: Adults Source Type: forums