A 21-year-old woman has a primary complaint of menorrhagia….

A 21-year-old woman has a primary complaint of menorrhagia. Her coagulation screen gives the following results. What disorder is most likely? Test Result Reference range Prothrombin time (PT) 12.0 seconds 11-15 seconds Partial thromboplastin time (PTT) 40 seconds 25-37 seconds Factor VIII activity 35% 50%-150% Platelet count 225 x 109/L 150-400 x109/L