3 Days Of Worsening in Pediatrics — Case | Pediatric Gastroenterology | SMLE Q#19747
SMLE Question #19747
Pediatrics
Pediatric Gastroenterology
Objective: OBJ-285
Last updated: April 2026
A 5-week-old boy is brought to the clinic for 3 days of worsening vomiting after feeds. The vomiting is forceful and projectile, nonbilious, and occurs shortly after feeding. He remains hungry after vomiting. Exam shows mild dehydration and visible peristaltic waves in the upper abdomen. Which test is the best to confirm the diagnosis?
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