Support for genetic testing with negative sweat test

I know we often say you can have a negative sweat test and still have cf and have noted several here have had that happen and have recommended posters to push doctors for genetic tests when cf symptoms but negative sweat test. But it sounds like the doctors don't buy it...well in searching for something else I found this from cff.org

http://ift.tt/1LQYx3l

Guideline 16 summarizes this point with a reference to a journal article. So those pushing for genetic testing based on symptoms this might help.

Support for genetic testing with negative sweat test