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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 between 40-60 mmo1/1 on two separate occasions. Which of the following test should be performed next to suppo the diagnosis of Cystic fibrosis:

A
Repeat Sweat chloride levels on a different day
B
Demonstrate an abnormal nasal potential difference
C
Demonstrate an abnormal F508 mutation by DNA analysis
D
Demonstrate an abnormal 72 hour fecal fat
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