Recurrent Pneumonias in Pediatrics — 3yo Child | Pediatric Respiratory | SMLE Q#665
SMLE Question #665
Pediatrics
Pediatric Respiratory
Last updated: February 2026
A 3-year-old boy is evaluated for poor weight gain and chronic productive cough with recurrent pneumonias. His stools are bulky, foul-smelling, and difficult to flush. Examination shows a thin child with scattered bilateral crackles. Family history includes a cousin with cystic fibrosis. What is the most appropriate initial diagnostic test to confirm cystic fibrosis in this child?
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