The coagulation profile in a 13-year old girl with menorrhagia having von Willebrand's disease is ?: (A) Isolated prolonged PTT with a normal PT, (B) Isolated prolonged PT with a normal PTT, (C) Prolongation of both PT and PTT, (D) Prolongation of thrombin time
Answer is A. Ans. is 'a' i.e., Isolated prolonged PTT with a normal PT