Hi, My son, Jackson (2), is awaiting his sweat test on Wed 3/14/07. We had one with my daughter when she was three, but she was negative, and progressed normally. I want some advice. I am a jump in full guns kind of mom, so I do all my research before the tests. This is what we are seeing: Failure to Thrive, low weight (25 lbs now), Sinus infections since Nov 06, very small for his age, eats constantly, drinks constantly, does not normally sleep through the night. We recently saw the Ear Nose Throat specialist and found that he has large adenoids (not large enough to take out now). What does everyone think. Does this sound like it could be CF. I have a great Pedi. and Endo working with us now, and they have been suggesting a sweat test since he was about 6 months. I just spoke to his doc Wed, he doen't know why it was put off so long. He says he doesn't think it sounds like CF, but wants to rule it out. Thanks for the advice. Denise Meri