<prompt> The coagulation profile in a 13 year old girl with menorrhagia having von Willebrand;s disease isIsolated prolonged PTT with a normal PTIsolated prolonged PT with a normal PTTProlongation of both PT and PTTProlongation of thrombin time  <response>: In vonwillebrand disease aPTT will be prolonged and PT will be normal. Reference: GHAI Essential pediatrics, 8th edition 