Factor VII deficiency - Overview
Extrinsic factor deficiency
Definition of Factor VII deficiency:
Factor VII deficiency is an inherited disorder in which a lack (deficiency) of plasma protein factor VII leads to abnormal bleeding.
Causes, incidence, and risk factors:
When you bleed, the body launches a series of reactions that help the blood clot. This is called the coagulation cascade. The process involves special proteins called coagulation or clotting factors. When one or more of these clotting factors are missing, there is usually a higher chance of bleeding.
This disorder occurs when the body does not have enough factor VII, an important blood clotting protein. Most often a deficiency of factor VII is caused by:
- Lack of vitamin K due to long-term use of antibiotics, bile duct obstruction, or poor absorption of vitamin K from the intestines. Some babies are born with vitamin K deficiency.
- Severe liver disease
- Use of drugs that prevent clotting (anticoagulants such as warfarin or Coumadin)
It is very rare to be born with factor VII deficiency that is due to the body's inability to make working factor VII.
- Reviewed last on: 2/28/2011
- 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.
Gailani d, Neff AT. Rare coagulation factor deficiencies. In: Hoffman R, Benz EJ Jr, Shattil SJ, et al, eds. Hoffman Hematology: Basic Principles and Practice. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier;2008:chap 127.
Kessler C. Hemorrhagic disorders: coagulation factor deficiencies. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa:Saunders Elsevier;2007:chap 180.
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