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Antithrombin Deficiency

Abstract

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NORD is very grateful to Kenneth A. Bauer, MD, Professor of Medicine, Harvard Medical School, for assistance in the preparation of this report.

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 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 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

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