A 5-Year-Old Boy Is Brought to the Emergency Department Due

A 5-year-old boy is brought to the emergency department due to 2 days of dark, low-volume urine and decreased energy.  The parents say that the boy had abdominal pain, fever, and bloody diarrhea for 4 days, which resolved about 3 days ago without treatment.  The day before the onset of symptoms, the patient swam in a lake and ate hamburgers at a family picnic.  His vital signs are within normal limits.  Physical examination shows pallor but is otherwise normal.  He has no peripheral edema or rashes.  Laboratory evaluation shows anemia, thrombocytopenia, and elevated blood urea nitrogen and serum creatinine.  Which of the following findings is most likely to be seen in this patient?

A) Elevated haptoglobin level
B) Elevated serum indirect bilirubin
C) Elevated thrombin and prothrombin time
D) Low fibrinogen and elevated D-dimer level
E) Positive Coombs test
F) Positive Streptozyme test

Correct Answer:

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