My son was diagnosed with CF when he was 2 years old, as he went into the hospital with pneumonia and had 2 positive sweat test(70 & 72). SO after going to the doctor for this diagnosis of a disease I had never even heard about, and is definately not in my family, we started him on all the meds for CF. He was involved with all of this for one year, and then it came to the doctors attention that something was missing in his blood work for CF, the blood work that someone failed to look at i the beginning fo all of this. So anyhow we were sent to the Childrens Hospital in Toronto where they did some more sweat tests which still came back in the low 40s range, which puts hi at borderline. Here we are 6 years later, after nobody following up with him, and due to my probing, he is now being retested for CF. His last sweat test came back at (40) which is still borderline, but he has had no issues as far as weight or growth, or any other illnesses, he hasnt had any respiratory problems at all. I am just confused by all of this borderline stuff. ANy help or advice????