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Review Question - QID 210718

Von Willebrand Disease Evaluation Normal or ↑ PTT (like hemophilia) QID: 210718 (M1.OMB.18.1)
In scope icon M 2 B
QID 210718 (Type "210718" in App Search)
A 14-year-old boy is brought to the emergency department from school after falling in gym class. He was unable to stand after the accident and has a painful and swollen knee. On presentation he says that he has never had an incident like this before; however, he does suffer from hard to control nosebleeds and prolonged bleeding after minor cuts. Based on his presentation a panel of bleeding tests is obtained with the following results:

Bleeding time: Prolonged
Prothrombin time: Normal
Partial thromboplastin time: Prolonged

Which of the following describes the function of the component that is defective in the most likely cause of this patient's symptoms?
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