A supplied maintenance-fluid calculation and a changing patient

A fictional arithmetic station explicitly supplies the Holliday-Segar daily model: the first ten kilograms contribute 100 mL per kilogram and the next ten kilograms contribute 50 mL per kilogram. The child weighs fourteen kilograms. A trainee correctly calculates the daily model volume, then copies it into a clinical plan for a different postoperative child with ongoing losses, abnormal sodium and a changing fluid balance. The supervisor separates arithmetic accuracy from the actual indication and monitoring decision. The exercise provides its own formula and does not claim that every hospitalized child needs the same solution or rate. Clinical circumstances, glucose, electrolytes, oral intake, losses and reassessment still matter, and the station supplies no individualized prescription.