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General Medicine General 62b10b19

In a child with respiratory distress, failure to thrive. His sweat chloride leveles were estimated 35 meq/L and 41 meq/L. What is next best test to do cystic fibrosis for diagnosis aEUR'

A
Nasal transmembrane potential difference
B
DNA analysis AF 508 mutation
C
CT chest
D
72 hour fecal fat estimation

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