DF508 is also tested for on every single panel test~ any test the dr orders (i.e. the cheap 37 mutation panels) will always include that one. In our case as well, that's the gene I carry and it's so much easier to catch that one than some obscure one requiring expensive testing. It's tough in my dh's case~ we don't know his mutation so it's impossible to know which family members are carriers and which are not, so testing of 'significant others' is essential when it comes to anyone on that side of childbearing age. Some have done it, some have not. It's a VERY big family... to be honest, I wouldn't be surprised to see CF crop up again.