Inclusion Criteria:  This study included children, aged 1 week-18 years, referred to Sohag university hospital for evaluation of bleeding symptoms, family history of a bleeding disorder and/or abnormal coagulation studies. Bleeding questionnaire is done during patients' clinic visit.  Exclusion Criteria:  Patients older than 18 years. Other inherited or acquired bleeding disorders. Patients on regular antiplatelets or anticoagulants.  Inclusion Criteria:  This study included children, aged 1 week-18 years, referred to Sohag university hospital for evaluation of bleeding symptoms, family history of a bleeding disorder and/or abnormal coagulation studies. Bleeding questionnaire is done during patients' clinic visit.  Exclusion Criteria:  Patients older than 18 years. Other inherited or acquired bleeding disorders. Patients on regular antiplatelets or anticoagulants.