Majid Naderi - Departement Of Pediatrics Hematology & Oncology, Ali Ebn-e Abitaleb Hospital Research Center For Children And Adolescents Health [RCCAH], Zahedan University of Medical Sciences, Zahedan, IR Iran
Shadi Tabibian - Department of Hematology, Allied Medical School, Tehran University of Medical Sciences, Tehran, IR Iran
Maryam Sadat Hosseini - Department of Hematology, Allied Medical School, Tehran University of Medical Sciences, Tehran, IR Iran
Shaban Alizadeh - Department of Hematology, Allied Medical School, Tehran University of Medical Sciences, Tehran, IR Iran
Soudabeh Hosseini - Department of Hematology, Allied Medical School, Iran University of Medical Sciences, Tehran, IR Iran
Hossein Karami - Thalassemia Research Center, Mazandaran University of Medical Sciences, Sari, Iran
Hassan Mahmoodi Nesheli - Non- Communicable Pediatric Disease Research Center, Babol University of Medical Sciences, Babol, Iran
Akbar Dorgalaleh - Department of Hematology, Allied Medical School, Tehran University of Medical Sciences, Tehran, IR Iran

Rare bleeding disorders (RBDs) are a heterogeneous group of disorders including different types of coagulation factor deficiencies. The disorders are inherited in an autosomal recessive manner with different frequencies varying from ۱:۵۰۰۰۰۰ to ۱:۲۰۰۰۰۰۰. Patients affected with RBDs are presented with a wide spectrum of clinical manifestations ranging from mild to life threatening bleeding diathesis. These disorders are usually present in regions with high rate of parental consanguinity. Despite the rare incidence of RBDs, it is necessary for physicians to be aware of these disorders. Here we aim to have a comprehensive review on general features and also the recent advances in understanding of RBDs. MEDLINE and Web of Science databases searched for English sources from ۱۹۹۰ to ۲۰۱۴, using the following keywords: rare bleeding disorder, rare inherited disorder, factor deficiency, structure, function, epidemiology, manifestations, laboratory analysis, diagnosis, mutation, treatment, management and also all the factor deficiencies which are considered as RBD. Knowledge towards RBDs is increasing, however, most of published data are limited to small group of populations or case reports. Therefore, there are still several questions on these rare disorders which need to be clarified through large prospective studies.

Rare Diseases, Bleeding disorder, Factor, Deficiency, Epidemiology, Diagnosis, Treatment