A 5-Year-Old Boy Is Brought to the Physician for Evaluation

A 5-year-old boy is brought to the physician for evaluation of pallor and increasing lethargy for 3 days. Six days ago, he experienced abdominal pain, vomiting, and bloody diarrhea that have since resolved. The day before the onset of symptoms, the patient swam in a lake and ate hamburgers at a family picnic.  His temperature is 38.8°C (101.8°F) , pulse is 128/min, respirations are 30/min, and blood pressure is 96/60 mm Hg. Examination shows pale conjunctivae and scleral icterus. 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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