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Cystic Fibrosis — UKMLA MCQ

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EasyPaediatricsCystic FibrosisUKMLA

A 5-year-old child has a persistent, productive cough for over 4 weeks and multiple chest infections. A sweat chloride test is positive. Which condition is most likely?

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Correct answer: D — Cystic fibrosis

A positive sweat chloride test, alongside chronic respiratory symptoms, strongly indicates cystic fibrosis. Primary ciliary dyskinesia also causes recurrent infections but normal sweat test. Asthma does not cause a positive sweat test. BPD occurs in premature infants with ventilation history. TB is confirmed by other investigations.

Reference: BNFC Cystic Fibrosis