<prompt> Bleeding time is abnormal in:HaemophiliaChristmas diseaseVon-Willebrand diseaseVitamin K-deficiency  <response>: Von Wille brands disease: Ref: 649-R, 428-HM BLEEDING TIME: - This test is dependent upon capillary function as well as on platelet number and ability of platelets to adhere to form aggregates Normal range - 3-8 minutes Prolong bleeding time may be due to: 1. Thrombocytopenia 2. Disorder of platelet function 3. Von Willebrands function 4. Vascular abnormalities eg. Ehler-Danlos syndrome 5. Severe - deficiency of factor V and XI 