A 9-Year-Old Boy Is Brought to the Physician for a Follow-Up

A 9-year-old boy is brought to the physician for a follow-up examination after the removal of a tooth. During the procedure, he had prolonged bleeding that did not resolve with pressure and gauze packing and eventually required suture placement. Physical examination shows a soft and nontender abdomen.  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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