What Are Hemophilia A and B?

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Hemophilia A and B are the two main types of hemophilia. Both types are classified as mild, moderate, or severe. How to diagnose is based on the volume of clotting factor VIII or IX in the blood. The clotting factors involved are different. Patients with hemophilia A have no or inadequate clotting factor VIII. On the contrary, patients with hemophilia B have no or inadequate clotting factor IX. Therefore, hemophilia A is also known as classic hemophilia or factor VIII deficiency, whereas hemophilia B is also named Christmas disease or factor IX deficiency. It is estimated that the incidence of hemophilia B is four times less than hemophilia A. About 8 out of 10 people with hemophilia are diagnosed with hemophilia A.   Keywords: hemophilia a and b