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Possibility for CF

Question
Dr. Doudounakis,

I am sorry to trouble you again, but I am writing you again and again because I am very worried. It is about the child that did the sweat test at Rio Hospital with the result of 59. I was told by the laboratory there that their reference values are higher (0-60 for normal) because they measure both sodium and clorium. Do you think I must be worried, given the fact that the genetic testing of the child for 95% of the CF mutations came up negative? We have tried at least 10 times to do another sweat test but the child does not sweat.
Answer
Dear friend,

You visited our CF center, where we perfomed a sweat test to your child with the mehtod of iontophoresis of pilocarpine. The sweat quantity was sufficient and the results were normal (Cl: 30 mmol/lt). This puts all your worries to rest and closes the subject in a most satisfactory way. Your child does not have CF.
Yours friendly,
Dr. Stavros Doudounakis
15.11.2012