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Congenital antithrombin III deficiency - Overview

Alternative Names

Deficiency - antithrombin III - congenital; Antithrombin III deficiency - congenital

Definition of Congenital antithrombin III deficiency:

Congenital antithrombin III deficiency is a genetic disorder that causes the blood to clot more than normal.

Causes, incidence, and risk factors:

Antithrombin III is a protein in the blood that naturally blocks blood clots from forming. Congenital antithrombin III deficiency is an inherited disease. It occurs when a person receives one abnormal copy of a gene from a parent with the disease.

The abnormal gene leads to low levels of antithrombin III. These low levels of antithrombin III can cause abnormal blood clots (thrombi) that may damage organs.

Often, patients with this condition will have a blood clot at a young age and will have a family member who has also experienced a blood clotting episode.

Venous blood clot

Reviewed last on: 3/2/2009
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Schafer A. Thrombotic disorders: Hypercoagulable states. In: Goldman L, Ausiello D. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007:chap 182.

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