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A 25-year-old woman, gravida 2, para 1, is brought to the emergency department at 39 weeks' gestation in active labor. Her first child was delivered at 40 weeks' gestation by elective cesarean section due to limited range of motion in her hip. The patient has sickle cell disease. She has had multiple episodes of acute chest syndrome and has required several transfusions in the past. An uncomplicated repeat cesarean section is performed, and a 2.7-kg (6-lb) infant is delivered with approx. 550 mL blood loss. Perioperatively, she received one dose of intravenous cefazolin. Following the surgery, the patient continues to bleed, and she receives a transfusion of 1 unit of packed red blood cells. One hour later, the patient begins to have flank pain and appears to be in acute distress. Her temperature is 38.5°C (101.3°F), pulse is 111/min, respirations are 22/min, and blood pressure is 99/50 mm Hg. Pulse oximetry on room air shows an oxygen saturation of 97%. Foley catheter shows dark brown urine. Further evaluation of this patient is most likely to show which of the following?

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