<prompt> The coagulation profile in a 13-year old girl with Menorrhagia having Von Willebrands disease is:Isolated prolonged PTT with a normal PTIsolated prolonged PT with a normal PTTProlongation of both PT and PTTProlongation of thrombin time  <response>: Answer is A Isolated prolonged PTT with a normal PT Von Willebrand disease is characterized by prolonged bleeding time and a prolonged PTT. The prothrombin time is normal. 