Breanna,
I posted on the other thread... I now see you did start a new message -- great! Here is my post again.
To answer your question about the sweat test at 59 -- it is on the low side, but it is (as far as I know) a positive result. I have been told that borderline is 40... well I take that back, yes.... 40 to 60 is borderline but given his other symptoms with a 59 I would think he could be diagnosed with CF -- your docs might want to do further testing for sure. A blood test (genetic) testing would be good, but some people find they still end up with inconclusive results because it might only find one identified gene, not the needed two genes. But that can be found out later for now it sounds like he is starting to get the treatment that he needs -- what is the nebulized treatment you mentioned? Many people with CF use albuteral (to help open the airways), pulmozyme (to thin the mucus in the lungs so it is easier to cough up) and tobramycin (tobi) which is an inhaled antibiotic.
Keep learning what you can and push for the genetic testing to be done. I hope your son feels better soon.
Oh, and by the way, my kids sweat tests numbers are 38 & 41. They both had genetic testing done and we found they both have DeltaF508 & R117H gene mutations -- positive for CF. The low sweat test numbers just indicates that the body is doing a pretty good job of doing whatever it does with the chloride.
Below is some information I copied from a website about sweat tests.
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Sodium and chloride are part of your body?s electrolyte balance. They help regulate the fluid balance in your blood and tissues. Normally, chloride travels in and out of the body?s cells, helping to maintain electrical neutrality and water balance. Chloride?s level usually mirrors that of sodium.
When a patient has cystic fibrosis (CF), they have inherited a mutated (abnormal) pair of genes on chromosome number 7. These genes normally produce a protein (cystic fibrosis transmembrane conductance regulator (CFTR)) that serves as a channel, letting chloride out of cells and into the surrounding fluid. When a mutation is present, the CFTR protein may not work properly or be totally absent. Since CFTR levels are usually highest in the cells lining the internal surfaces of the pancreas, sweat glands, salivary glands, intestine, and reproductive organs, these are the areas most affected by CF.
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