Ten hours following circumcision, a 4-day-old boy has persistent bleeding at the circumcision site. He was born at term following an uncomplicated pregnancy and delivery. Examination shows a left temporal cephalohematoma. Laboratory studies show:
Platelet count 300,000/μL
Bleeding time 5 minutes
Prothrombin time 14 seconds
Partial thromboplastin time 52 seconds
Which of the following is the most likely explanation for these findings?
Bernard-Soulier syndrome
Glanzmann thrombasthania
Hemophilia
Vitamin K deficiency
von Willebrand disease
