In my experience, jsut because nothing shows up on the genetic testing does not mean that you or your child does not have a more rare form of the mutated gene. When my son and his father and i had genetic testing done, it turned out that I carry one of the 10 mutations of the 21 version of CAH (these are the only mutations they test for here in New Brunswick/Nova Scotia Canada). My sons father showed as not even being a carrier, but like I said, that is because they do not test for all known mutations of the gene. Also, there are probably many mutations which are not known of, and therefore cannot be tested for.

So, I guess long story short, just because nothing shows up on the tests, doesn’t mean nothing is there.