Diseases & Conditions


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Antithrombin Deficiency


Synonyms of Antithrombin Deficiency
  • AT 3
  • AT III Deficiency
  • Thrombophilia, Hereditary, Due to AT III

Disorder Subdivisions

  • Antithrombin III Deficiency, Classical (Type I)
  • AT III Variant IA
  • AT III Variant Ib


General Discussion
Antithrombin deficiency is a blood disorder characterized by the tendency to form clots in the arteries and/or veins (thrombosis). An inherited tendency to thrombosis is known as thrombophilia. Antithrombin is a substance in the blood that limits the blood's ability to clot (coagulation). In people with congenital antithrombin deficiency, there is usually a reduced amount of this substance in the blood due to a genetic abnormality. Antithrombin deficiency may also be acquired; in such cases, the disorder may be reversible with treatment.

Organizations related to Antithrombin Deficiency
  • American Liver Foundation
    75 Maiden Lane
    New York NY 10038
    Phone #: 212-668-1000
    800 #: 800-465-4837
    e-mail: info@liverfoundation.org
    Home page: http://www.liverfoundation.org
  • March of Dimes Birth Defects Foundation
    1275 Mamaroneck Avenue
    White Plains NY 10605
    Phone #: 914-428-7100
    800 #: 888-663-4637
    e-mail: Askus@marchofdimes.com
    Home page: http://www.marchofdimes.com
  • NIH/National Heart, Lung and Blood Institute
    31 Center Drive MSC 2480
    Bethesda MD 20892-2480
    Phone #: 301-592-8573
    800 #: --
    e-mail: nhlbiinfo@rover.nhlbi.nih.gov
    Home page: http://www.nhlbi.nih.gov/
  • National Alliance for Thrombosis and Thrombophilia
    120 White Plains Road
    Tarrytown NY 10591
    Phone #: 914-220-5040
    800 #: 877-466-2568
    e-mail: info@stoptheclot.org
    Home page: http://stoptheclot.org/index.htm



For a Complete Report

This is an abstract of a report from the National Organization for Rare Disorders, Inc. ? (NORD). A copy of the complete report can be obtained for a small fee by visiting the NORD website. The complete report contains additional information including symptoms, causes, affected population, related disorders, standard and investigational treatments (if available), and references from medical literature. For a full-text version of this topic, see http://www.rarediseases.org/search/rdblist.html