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Definitions of Factor XII Deficiency:

An absence or reduced level of blood coagulation factor XII. It normally occurs in the absence of patient or family history of hemorrhagic disorders and is marked by prolonged clotting time. - (Source - Diseases Database)

Factor XII Deficiency is listed as a "rare disease" by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that Factor XII Deficiency, or a subtype of Factor XII Deficiency, affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)

Ophanet, a consortium of European partners, currently defines a condition rare when it affects 1 person per 2,000. They list Factor XII Deficiency as a "rare disease".
Source - Orphanet

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Factor XII Deficiency

Symptoms of Factor XII Deficiency