A 4-year-old boy is brought to the emergency department with a 2-day history of diarrhea, which has recently become bloody. He has a fever, irritability, and decreased urine output. Physical examination reveals pallor and mild abdominal tenderness. Laboratory findings include:
• Hemoglobin: 7.8 g/dL (low)
• Platelet count: 40,000/µL (low)
• Blood urea nitrogen (BUN): 45 mg/dL (elevated)
• Creatinine: 2.3 mg/dL (elevated)
• Peripheral smear: Schistocytes
Which of the following is the most appropriate next step in management?
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