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Definitions and terminology

There are three levels of severity of haemophilia: mild, moderate, and severe. The severity of haemophilia depends on the amount of clotting factor in the person’s blood.

Any person (male or female) with 5-40 per cent of the normal amount of clotting factor has mild haemophilia.

A person with between 1-5 per cent of the normal amount of clotting factor has moderate haemophilia.

A person with less than 1 per cent of the normal amount of clotting factor has severe haemophilia.

A woman who has less than 40 per cent of the normal level of clotting factor is no different from a man with the same factor levels—she has haemophilia.

Some carriers have symptoms of haemophilia even though their clotting factor levels are above 40 per cent. A woman with levels of 40-60 per cent of the normal amount of clotting factor who experiences abnormal bleeding is called a symptomatic carrier.