Factor XII Deficiency
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NORD is very grateful to Robert W. Colman, MD, Sol Sherry Thrombosis Research Center and Hematology Division, Professor of Medicine, Temple University School of Medicine, for assistance in the preparation of this report.
Synonyms of Factor XII Deficiency
- F12 deficiency
- HAF deficiency
- Hageman factor deficiency
- Hageman trait
- No subdivisions found.
Factor XII deficiency is a rare genetic blood disorder that causes prolonged clotting (coagulation) of blood in a test tube without the presence of prolonged clinical bleeding tendencies. It is caused by a deficiency of the factor XII (Hageman factor), a plasma protein (glycoprotein). Specifically, factor XII is a clotting factor. Clotting factors are specialized proteins that are essential for proper clotting, the process by which blood clumps together to plug the site of a wound to stop bleeding. Although it is thought that factor XII is needed for proper blood clotting, when it is deficient, other blood clotting factors appear to compensate for its absence. Therefore, the disorder is thought to be benign and usually presents no symptoms (asymptomatic); it is usually only accidentally discovered through pre-operative blood tests that are required by hospitals.
Factor XII deficiency was first described in the medical literature in 1955 by doctors Oscar Ratnoff and Jane Colopy in a patient named John Hageman. The disorder is sometimes known as Hageman factor deficiency or Hageman trait.
Organizations related to Factor XII Deficiency
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