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A 10-month-old baby boy who is bleeding profusely from the mouth is brought to the emergency department. The mother states that the baby cut himself with his newly erupted teeth after chewing on a teether ring. She also states that he has been bruising easily as well, but thought nothing of it. Upon further questioning, a family history of “bleeding” is present in the maternal grandfather. On examination, there is active bleeding in the oral cavity. Vital signs are stable, the baby is active but distressed.
Which of the above laboratory findings are characteristic of hemophilia B? PT refers to prothrombin time, and aPTT refers to activated partial thromboplastin time.
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