A 3-year-old girl presented to the emergency department after an episode of hematemesis at home. She was previously healthy and had no recent illnesses. She had eaten cereal for breakfast three hours prior to presentation. A 22-gauge antecubital IV catheter was placed, and laboratory studies were done. Her hemoglobin was measured at 10.2 g/dL, and her electrolytes were normal. We sent a “type and screen” sample to the blood
APRIL 19, 2021