• Amy M O'Neil and James L Homme.
• Department of Emergency Medicine, Mayo Clinic, Rochester, Minnesota.
• J Emerg Med. 2016 Jan 1; 50 (1): 41-3.

BackgroundHematochezia in the pediatric population, particularly infants, has a wide differential diagnosis ranging from benign to life-threatening causes. Obtaining a thorough history and identifying risk factors for more ominous disease is vital during the emergency department (ED) evaluation.Case ReportThe patient is a 2-day-old female who presented to the ED with 8-10 episodes of bright red blood in her stools. She was otherwise asymptomatic, with an uncomplicated pregnancy and delivery. Her history was significant for a sibling who recently tested positive for Escherichia coli O157:H7 in his stool and a family history of lactose intolerance. She was exclusively formula fed. An abdominal plain film was obtained and was normal. Milk protein enterocolitis was suspected and she was transitioned to hydrolyzed formula with resolution of her symptoms. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: As emergency physicians, we need to be aware of the life-threatening conditions that are associated with hematochezia, such as necrotizing enterocolitis, and act quickly. However, many patients will have benign conditions, and recognizing the key historical and diagnostic pieces of the infant's presentation will prevent unnecessary evaluations and consultations.Copyright © 2016 Elsevier Inc. All rights reserved.

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