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You are seeing a 2 year old who is slowly improving from a bout of acute gastroenteritis manifested by fever, vomiting, diarrhea, and abdominal pain that started 5 days ago. The parent is concerned that he remains less active and appears pale. Vital signs are temperature 37.7, HR 135, RR 24, BP 110/60, O2 sat 99% on room air. Point of care hemoglobin is 6.5 g/dL.