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EM@3AM: Purpura

A 4-year-old vaccinated male is brought to the ED by his parents for 3 days of hematuria and abdominal pain. They present now because he refuses to ambulate. He has a rash on his legs that family attributes to playing outside in the grass. His vital signs include HR 135, RR 20, and temperature of 37.9 C. His abdomen is diffusely tender, and he has red, raised papules on the buttocks and lower legs. What is the diagnosis, and what is the most common gastrointestinal complication?