Girl with haemophilia

The vast majority of persons with haemophilia are male. It is, however, possible for a girl to have haemophilia.

Many carriers would be categorised as having mild haemophilia. However, it is possible due to lyonisation of the 'X' chromosome for a carrier to have severe haemophilia.

It is also possible for a girl to have severe haemophilia if her father is a person with haemophilia and her mother is a carrier.