F. W. G. Leebeek has served on advisory boards and received research funding Inhibitor Library supplier from Baxter and CSL Behring. M. Makris has served as a consultant and received honoraria for lecturing from CSL Behring. P. M. Mannucci receives speaker fees from Grifols and serves on the scientific board of Baxter. R. Winikoff has received reimbursement from CSL Behring for attending symposiums. E. Berntorp has received research grants from CSL Behring. E. Berntorp designed research, performed research, interpreted data, wrote the manuscript,

gave final approval of the version to be published; T. Abshire designed research, performed research, interpreted data, wrote the manuscript, gave final approval of the version to be published; A. Federici Ganetespib supplier designed research, performed research, interpreted data, wrote the manuscript, gave final approval of the version to be published; M. Alvárez performed research; J. Bowen collected data, analysed data, wrote the manuscript; M. Carcao designed research, performed research, gave critical review of the content; J. Gill designed research, performed research;

N. Key performed research, gave critical review of the content; P. Kouides designed research, performed research; K. Kurnik designed research, gave critical review of the content; A. Lail analysed the data, wrote the manuscript; F. Leebeek designed research, performed research, gave critical review of the content; M. Makris designed research, performed research, gave Histone demethylase critical review of the content; P. Mannucci designed research, performed research, gave critical review of the content; R. Winikoff designed research, performed research. “
“Summary.  Congenital defects of platelets or plasma proteins involved in blood coagulation generally lead to bleeding disorders. In some of these disorders, patients with a severe phenotype are prone to spontaneous bleeds with critical consequences. This situation occurs more commonly in haemophilia A and haemophilia B and to a certain extent in severe forms (type 3) of von Willebrand disease. Defects in other plasma coagulation

proteins and platelet factors are relatively rare, with an incidence of ≤1: 1–2 million. Molecular genetic studies of the human coagulation factors, especially factors VIII and IX, have contributed to a better understanding of the biology of these genetic disorders, the accurate detection of carriers and genetic counselling, and have also fostered new therapeutic strategies. This article reviews the evolution of genetics over the last five decades as a tool for bleeding disorder investigations, the recent advances in molecular techniques that have contributed to improved genetic diagnosis of this condition, and the development and utility of proficiency testing programmes and reference materials for genetic diagnosis of bleeding disorders.