Jump to main content

Hemophilia A

What is Hemophilia A?

Hemophilia A is the most common type of hemophilia and is caused by deficient or dysfunctional clotting factor VIII. Although hemophilia A is usually inherited, about 30% of cases are caused by a spontaneous mutation in the person’s own genes. Hemophilia A affects about 1 in 12,000 people and is diagnosed by taking a blood sample and measuring the level of factor activity in the blood. Hemophilia A is diagnosed by testing the level of factor VIII activity in the blood. Hemophilia A can be mild, moderate, or severe, depending on how much clotting factor is in an affected person's blood. However, about 60% of patients have the severe form of the disorder. People with hemophilia A have prolonged bleeding after an injury, surgery, or tooth extraction. In severe cases, they may bleed once or twice a week and often the bleeding is spontaneous, which means it happens for no obvious reason. Serious complications can result from bleeding into the joints, muscles, brain, or other internal organs. In a mild case of hemophilia A, the disorder may remain unknown until after a surgery or serious injury. Treatment for hemophilia A is very effective and with appropriate treatment and care, people with hemophilia A can live perfectly healthy lives. The main treatment is called replacement therapy, during which clotting factor VIII is infused into a vein either prophylactically (preventatively) or on-demand to prevent or treat bleeds.

Resources for you

Hemophilia Expert Information on hemophilia A and B, diagnosis, treatment options and other help for living with hemophilia.    Website (in German)
CSL Behring CARE Service for patients starting home self-therapy with a CSL Behring drug.   Website (in German)
WFH (World Federation of Hemophilia) Global organization aiming to improve healthcare for people with inherited bleeding disorders.   Website
 GSAV-Info  Information on the regulation of drug supply for hemophilia patients.   Website (in German)