Triples15- sweat chloride does generally increase slightly with age, this study http://www.ncbi.nlm.nih.gov/pubmed/18589442 found the following results in a non CF population:
The estimated median (95% RI) for sweat chloride were: 5 to 9 years, 13 mmol/L (1-39 mmol/L); 10 to 14 years, 18mmol/L (3-47 mmol/L); 15 to 19 years, 20 mmol/L (3-51mmol/L); and 20+ years 23 mmol/L (5-56mmol/L).
I personally was 110 at age 3 when I was diagnosed and now 102 at age 27. At age 3 I did not sweat much and only just got to the 80mg weight (any lower and often they will retest as the results may not be accurate). I think this is why it was higher. At age 3 I also had a test before this with a weight of 40mg and sweat chloride of 130, but this was repeated as they said it was inaccurate due to the low weight.
I guess I'm just saying there are other factors that can influence the test (like aboveallislove said with the salt intake), and I know of a few people who have tested lower later in life (but this could be to do with the testing, eg the weight as I mentioned above and the testing is probably more accurate now than 20 years ago as well).
I hope you can get Kalydeco soon
The estimated median (95% RI) for sweat chloride were: 5 to 9 years, 13 mmol/L (1-39 mmol/L); 10 to 14 years, 18mmol/L (3-47 mmol/L); 15 to 19 years, 20 mmol/L (3-51mmol/L); and 20+ years 23 mmol/L (5-56mmol/L).
I personally was 110 at age 3 when I was diagnosed and now 102 at age 27. At age 3 I did not sweat much and only just got to the 80mg weight (any lower and often they will retest as the results may not be accurate). I think this is why it was higher. At age 3 I also had a test before this with a weight of 40mg and sweat chloride of 130, but this was repeated as they said it was inaccurate due to the low weight.
I guess I'm just saying there are other factors that can influence the test (like aboveallislove said with the salt intake), and I know of a few people who have tested lower later in life (but this could be to do with the testing, eg the weight as I mentioned above and the testing is probably more accurate now than 20 years ago as well).
I hope you can get Kalydeco soon