What is the risk of passing on haemophilia during a pregnancy?
Men who have haemophilia and some women who are genetic carriers may be concerned about the possibility of passing on the faulty gene to future generations. Genetic Counsellors can talk through any concerns and discuss the options available. The risk of passing on haemophilia during each pregnancy If the mother is a genetic carrier (has one faulty gene and one working gene): • There is a one in four chance a boy will inherit the faulty gene and have haemophilia. • There is a one in four chance a boy will inherit the working gene and will not have haemophilia. • There is a one in four chance a girl will inherit the faulty gene from her mother and a working gene from her father, and will be a genetic carrier of haemophilia, usually without symptoms of haemophilia. • There is a one in four chance that a girl will inherit two working genes and not carry the faulty gene. If the father has haemophilia: • Boys will not inherit haemophilia as they get their X chromosome from their mother. • Gi
