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11740 Medicine

A seven year old child with recurrent chest infections and exocrine pancreatic insufficiency is suspected of having cystic fibrosis. Sweat chloride levels have been observed to be between 40-60 mmol/l on two separate occasions. Which of the following test should be performed next to suppo the diagnosis of Cystic fibrosis?

ARepeat sweat chloride levels on a different day
BDemonstrate an abnormal 72 hour fecal fat collection
CDemonstrate an abnormal nasal potential difference (Correct Answer)
DDemonstrate an abnormal F508 mutation by DNA analysis