A 15-Year-Old Boy Is Brought to the Emergency Department with Fever

A 15-year-old boy is brought to the emergency department with fever, purulent nasal discharge, and epistaxis.  The patient has had fever and persistent nasal discharge for the past 10 days.  He developed intermittent epistaxis 2 days ago that has been difficult to control.  The patient has also had easy bruising for the past 2 months.  Medical history is significant for cystic fibrosis, and he has not been taking his prescribed medications.  Results of coagulation studies are as follows: Which of the following coagulation factors is most likely to be abnormal in this patient?

A) Factor V
B) Factor VII
C) Factor VIII
D) Factor XII
E) Fibrinogen

Correct Answer:

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