A 2 month old male presents with multiple episodes of nonbil…

A 2 month old male presents with multiple episodes of nonbilious emesis over the past 3 days, extreme fussiness after vomiting, eagerness to eat, and decrease in wet diapers. The baby boy’s HR is 185, RR 45, and T 98.5 degrees F. Which order would cause the nurse to question the provider?