amberglp,
It would depend on how many mutations your genetic test searched for as to if it were to see if you actually have CF. If you were to have a common mutation as well as a non-common mutation, and the test done only test for the most common mutations, one could be missed.
I have two daughters with cystic fibrosis. My second one was tested at birth because of her big sister having CF. The genetic test came back stating that she was only a carrier. But I just felt it in my heart it was wrong. So at four weeks old, I took her with me to a CF clinic appt for my older daughter, and they did a sweat test as well as a more extensive genetic test, and her second mutation did in fact show up. It turns out that the first test done only tested for the top 20 common mutations, but the second one tested for the top 36 mutations, and it shows up on that test.
But there are over 1,000 mutations, with some not even found yet. Some genetic test will test for all the known mutations.
I wish you and your husband luck on your new baby<img src="i/expressions/face-icon-small-smile.gif" border="0">