GTR Home > Conditions/Phenotypes > Hereditary factor VIII deficiency disease

Summary

Excerpted from the GeneReview: Hemophilia A
Hemophilia A is characterized by deficiency in factor VIII clotting activity that results in prolonged oozing after injuries, tooth extractions, or surgery, and delayed or recurrent bleeding prior to complete wound healing. The age of diagnosis and frequency of bleeding episodes are related to the level of factor VIII clotting activity. Individuals with severe hemophilia A are usually diagnosed during the first two years of life following bleeding from minor mouth injuries and large "goose eggs" from minor head bumps. Without prophylactic treatment, they may average up to two to five spontaneous bleeding episodes each month including spontaneous joint bleeds or deep-muscle hematomas, and prolonged bleeding or excessive pain and swelling from minor injuries, surgery, and tooth extractions. Individuals with moderate hemophilia A seldom have spontaneous bleeding; however, they do have prolonged or delayed oozing after relatively minor trauma and are usually diagnosed before age five to six years; the frequency of bleeding episodes varies, usually from once a month to once a year. Individuals with mild hemophilia A do not have spontaneous bleeding episodes; however, without pre- and postoperative treatment, abnormal bleeding occurs with surgery or tooth extractions; the frequency of bleeding episodes varies widely, typically from once a year to once every ten years. Individuals with mild hemophilia A are often not diagnosed until later in life. Approximately 30% of heterozygous females have clotting activity below 40% and are at risk for bleeding (even if the affected family member is mildly affected). After major trauma or invasive procedures, prolonged or excessive bleeding usually occurs, regardless of severity.

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  • Also known as: AHF, DXS1253E, F8B, F8C, FVIII, HEMA, F8
    Summary: coagulation factor VIII

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