Which finding would confirm a diagnosis of cystic fibrosis?
a. A chest radiograph shows alveolar hyperinflation.
b. Stool analysis indicates significant amounts of fecal fat.
c. Sweat chloride is greater than 60 mEq/L.
d. Liver function levels are abnormal.
C
The diagnosis of cystic fibrosis requires a positive sweat test. A chloride level greater than 60 mEq/L is considered diagnostic for cystic fibrosis. Hyperinflation is one of the first findings on a chest radiograph of a child with cystic fibrosis. It does not confirm a diagnosis. A 72-hour fecal fat determination may be included in a diagnostic workup. Inability to secrete digestive enzymes causes steatorrhea. Liver function tests may be part of the diagnostic workup for cystic fibrosis.
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