What is the severity of hemophilia?
The severity of hemophilia A and hemophilia B may vary depending on the amount (or level) of factor VIII or factor IX in the patient’s blood. Normal blood clotting activity levels of Factor VIII and Factor IX range between 50 percent and 200 percent, where 100 percent is the average level in the unaffected person. Hemophilia may be severe, moderate, or mild. Severe. People with severe hemophilia have Factor VIII or Factor IX clotting activity levels less than 1 percent. About 43 percent of all the people with hemophilia are classified as severe. They often suffer frequent (weekly) internal bleeding episodes into joints, muscles, and tissues after injury or for no apparent reason. They are at risk for bleeding after dental work, surgery, and trauma. Moderate. People with moderate hemophilia have Factor VIII or Factor IX clotting activity levels between 1 percent and 5 percent. Just like people with severe hemophilia, people with moderate hemophilia are at risk for bleeding after trauma
