So..you are saying that the DNA testing of your son shows negatively that he has the gene mutation? And as for the testing of you and your husband, what was that? You mentioned that you have CAH in your family history.....from previous children or other forks of the family? Sorry for so many questions...I am just trying to get a more vivid picture toyour scenario. What ever the cause though...I hope for you son that all turns out great!