That is great that you have a pediatrician who is willing to find out some answers to see what might be causing your son's high liver enzymes. While those with cf often do have high liver enzymes (including my two-year-old son) but most of the time they will also have other problems gaining weight and/or lung involvement. My son gains weight well and does not have lung involvement. However, he was diagnosed at birth and therefore is on a lot of preventative medicines that keep him healthy. He is on Actigal which keeps his liver enzymes numbers low. It does not mean necessarily that his liver is functioning at 100%, but it helps.
Here is a link on the cff.org site that will explain more about the sweat test.
<a target=new class=ftalternatingbarlinklarge href="http://www.cff.org/UploadedFiles/publications/files/SweatTestFactSheetLH.pdf
">http://www.cff.org/UploadedFiles/publications/files/SweatTestFactSheetLH.pdf
</a>
Make sure that he is being tested at a hospital with a cf center. Local hospitals will often get a lot of false negatives.
Hoping for a negative test on Monday.
Sharon, mom of Sophia, 4 and Jack, 2 both with cf