They can do a nasal potential difference test to see how well the CFTR is functioning. Not all locations do this though and it probably wouldn't work out well in a young child so you would have to wait untill your child is older. They would probaly only even consider doing this test if it turned out your child had f508c instead of delf508. The delf508 causes a person to have NO functional CFTR protein whatsoever. This is because the protein is prevented from ever reaching the cell surface where it normally functions due to the fact it is slightly misfolded. In the case of delf508 the protein would actually work fine if it was able to reach the cell's surface.
So the first thing to find out is if it is even possible the lab could have made this mistake. If your testing was preformed by PAGE (polyacrylamide gel electrophoresis) ie the gel test...then you most likely contributed delta f508 (unless you have both delf508 and f508c which has happned before and only discovered due to carrier testing because the person's child had CF but that scenario it is extremely unlikely.) Find out how your husband's test was preformed. If his test was also preformed by PAGE then it is not very likely that your child has f508c instead of delf508 (unless you or your husband carries both mutations which is EXTREMELY unlikely.)
Have you spoken with your doctors about this??? If so what do they say???
It does seem unusual that your daughter's sweat has no salty taste to it. My son (no cf) sometimes even tastes extremely salty to me. Where are you tasting her?? her forehead...? As everyone has said, your daughter most likely has CF but has not yet developed pancreatic insuffiency (she's so young still and it is very common for it to develop over time) or has any lung problems. She should taste salty though at least once in a while. There is nothing wrong though with pushing your doctors to test her for the f508c mutation or to at least find out how testing was preformed.
So the first thing to find out is if it is even possible the lab could have made this mistake. If your testing was preformed by PAGE (polyacrylamide gel electrophoresis) ie the gel test...then you most likely contributed delta f508 (unless you have both delf508 and f508c which has happned before and only discovered due to carrier testing because the person's child had CF but that scenario it is extremely unlikely.) Find out how your husband's test was preformed. If his test was also preformed by PAGE then it is not very likely that your child has f508c instead of delf508 (unless you or your husband carries both mutations which is EXTREMELY unlikely.)
Have you spoken with your doctors about this??? If so what do they say???
It does seem unusual that your daughter's sweat has no salty taste to it. My son (no cf) sometimes even tastes extremely salty to me. Where are you tasting her?? her forehead...? As everyone has said, your daughter most likely has CF but has not yet developed pancreatic insuffiency (she's so young still and it is very common for it to develop over time) or has any lung problems. She should taste salty though at least once in a while. There is nothing wrong though with pushing your doctors to test her for the f508c mutation or to at least find out how testing was preformed.