Sweet Test on Both Parents Negative

Both my husband and myself had the Sweet test done.  Our family doctor said neither of us are the carrier.  Our son is a carrier.  His daughter has also been tested and is a carrier.  Can two parents who tested negative on the sweet test produce a child that is a CF carrier.  Or can we assume that the sweat tests may have been incorrect and we should get the blood test done.  I am caucasion and my husband is of African decendent.  Our family doctor thinks that I am probably the carrier. 

Hi,

Thank you.  When they were doing the sweat thest, they said this should actully show if either my husband or myself was the carrier.  Interesting.  I will have to contact the CF clinic and and request that they do the blood test as this is what they did for my son and daughter in law. 

Sweat test to see if you are a carrier ???? I think not only a DNA test will show if you carry the gene. There would be no way your children could have a gene you don't have. Instead of going to the same clinic that ran a insurance test I would go some where else, those test aren't cheap and that one was necessary on the both of you.