Welcome to the site. Sorry for the diagnosis.
Like Heather said there are a few very rare instances when something else could cause an elevated sweat chloride number but not very often. And if your doctor had any indication that something else was causing it, he/she probably would have been very careful with the wording chosen and not said she has CF.
I know everything probably seems very overwhelming right now. Hang in there, once you've had time to absorb the information it gets a little easier. Also I'm assuming they have started your daughter on enzymes -- so she will start absorbing the nutrients better and she should start putting on some weight.
Best wishes - keep posting and please let us know what happens with your other daughter.
Like Heather said there are a few very rare instances when something else could cause an elevated sweat chloride number but not very often. And if your doctor had any indication that something else was causing it, he/she probably would have been very careful with the wording chosen and not said she has CF.
I know everything probably seems very overwhelming right now. Hang in there, once you've had time to absorb the information it gets a little easier. Also I'm assuming they have started your daughter on enzymes -- so she will start absorbing the nutrients better and she should start putting on some weight.
Best wishes - keep posting and please let us know what happens with your other daughter.