A 12-Month-Old Boy Is Brought to the Office by His

A 12-month-old boy is brought to the office by his father due to prolonged bleeding from mouth after slipping and hitting his face on a coffee table.  He was born at term, and his mother died shortly after his birth due to bleeding complications following a home delivery.  Vital signs are normal.  He is awake and alert.  There is blood oozing from his gums and marked bruises along his trunk and thighs.  The remainder of the physical examination is normal.  Laboratory evaluation shows decreased von Willebrand Factor antigen levels and activity, measured via the ristocetin cofactor assay.  Which of the following sets of laboratory values is most likely present in this patient?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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