Factor XI Deficiency
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Factor XI Deficiency is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
- haemophilia C
- hemophilia C
- plasma thromboplastin antecedent deficiency
- PTA deficiency
- Rosenthal syndrome
Factor XI deficiency is a rare genetic bleeding disorder caused by reduced levels and insufficient activity of a blood protein called factor XI. Factor XI is a clotting factor. Clotting factors are specialized proteins that are essential for proper clotting, the process by which blood solidifies like glue to plug the site of a wound to stop bleeding. Individuals with factor XI deficiency do not bleed faster or more profusely than healthy individuals, but, because their blood clots poorly, they may have difficulty stopping the flow of blood from a deep or surgical wound. This may be referred to as prolonged bleeding or a prolonged bleeding episode. The severity of factor XI deficiency can vary from one person to another. In many cases, prolonged bleeding episodes only occur after surgery, dental procedures or trauma. Bleeding tendencies in factor XI deficiency are unpredictable and inconsistent, making the disorder difficult to manage in some cases. Factor XI deficiency is caused by disruptions or changes (mutations) to the F11 gene. Factor XI deficiency is inherited autosomally and can occur in people of either sex.
Factor XI deficiency was first described in the medical literature in 1953. It used to be also referred to as hemophilia C in order to distinguish it from the better known hemophilia types A and B. In rare cases, factor XI deficiency can be acquired during life (acquired factor XI deficiency). This report deals with the genetic form. Although the genetic form is present at birth, as it is a mild bleeding disorder symptoms do not usually occur until later in life.
National Hemophilia Foundation
116 West 32nd Street, 11th Floor
New York, NY 10001
Canadian Hemophilia Society
400-1255 University Street
Quebec, H3B 3B6
NIH/National Heart, Lung and Blood Institute
P.O. Box 30105
Bethesda, MD 20892-0105
World Federation of Hemophilia
1425 René Lévesque Blvd. W. Suite 1010
Quebec, H3G 1T7
Hemophilia Federation of America
210 7th St. SE
Washington, DC 20003
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
PO Box 241956
Los Angeles, CA 90024
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It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report
This disease entry is based upon medical information available through the date at the end of the topic. Since NORD's resources are limited, it is not possible to keep every entry in the Rare Disease Database completely current and accurate. Please check with the agencies listed in the Resources section for the most current information about this disorder.
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Last Updated: 8/28/2012
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