A 3-Year-Old Boy Comes to the Emergency Department for Evaluation

A 3-year-old boy comes to the emergency department for evaluation of oral bleeding that began 1 hour after a tooth extraction.  The bleeding has persisted for approximately 30 minutes despite application of constant pressure with gauze.  He has no significant past medical or surgical history.  The patient takes no medications, and his vaccinations are up to date.  Blood pressure is 90/60 mm Hg and pulse is 100/min.  On physical examination, he has slow oozing of blood at the site of the dental extraction.  Family history is significant for a maternal uncle who suffered from recurrent bleeding into his joints.  Which of the following is most likely to be abnormal in this patient?

A) Haptoglobin level
B) Hemoglobin level
C) Partial thromboplastin time
D) Platelet count
E) Platelet function analyzer
F) Prothrombin time
G) Thrombin time

Correct Answer:

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