A 12-Year-Old Boy Experiences Excessive Bleeding Following a Tooth Extraction

A 12-year-old boy experiences excessive bleeding following a tooth extraction.  His past medical history includes episodes of painful joint swelling from minor trauma.  Physical examination shows a soft and nontender abdomen with a liver span of 10 cm.  The spleen is not palpable.  Laboratory results are as follows: This patient most likely has a deficiency involving which of the following factors?

A) Factor VII
B) Factor VIII
C) Factor XI
D) Hageman factor
E) von Willebrand factor

Correct Answer:

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