Cystic fibrosis (CF) is suspected in a toddler. Which test is essential in establishing this diagnosis?
A) Bronchoscopy
B) Serum calcium
C) Urine creatinine
D) Sweat chloride test

Question

Quizplus · Accepted Answer

A sweat chloride test result greater than 60 mEq/L is diagnostic of CF. Bronchoscopy, although helpful for identifying bacterial infection in children with CF, is not diagnostic. Serum calcium is normal in children with CF. Urine creatinine is not diagnostic of CF.

Cystic Fibrosis (CF) Is Suspected in a Toddler