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You are seeing a 7-year-old boy with abdominal pain since yesterday afternoon. He has had one episode each of vomiting (non-bloody, non-bilious) and diarrhea (non-bloody) each day. He has been afebrile. His appetite is poor. He points to his umbilicus as his area of pain but is tender on palpation both periumbilical and in the right lower quadrant. Vital signs and the remainder of his exam are unremarkable. His CBC shows a WBC of 8.1 with 50% neutrophils, and his UA has no pyuria. RLQ ultrasound is read by the radiologist as appendix not visualized, no fat stranding or other signs of inflammation noted. He says he feels better and that he would eat pizza if he could.

What is your next best course of action?