<prompt> Which of the following feature may be used to differentiate hemophilia A from von Willebrand diseaseBleeding timeProthrombin timePaial thromboplastin timeFactor VIII levels  <response>: Answer is A Bleeding time : Bleeding time is prolonged in von Willebrand disease, but normal in Hemophilia A Both conditions present with decreased levels of factor VIII normal PT and elevated PTT and hence these features cannot be used to differentiate between hemophilia A and von Willebrand disease. Features of VWF and differences with Haemophilia A Feature Hemophilia A Von Willebrand Disease Inheritance Sex linked Autosomal Most common is A.dominant Factor VIIIc Decreased Decreased VWF Normal Decreased Ristocetin cofactor Normal Decreased Common Presentation Features of clotting disorder SkinMucosal bleeding -- Hemahrosis Features of bleeding disorder - clotting disorder SkinMucosal bleeding Hemohrosis Bleeding Time Normal Prolonged APTT Prolonged Prolonged may be normal PT Normal Normal Thrombin Time Normal Normal Fibrinogen Normal Normal Platelet aggregation in Response to Ristocetin Normal Decreased 