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Factor X deficiency
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Factor X Deficiency

Factor X deficiency is a rare bleeding disorder characterized by a shortage or impairment of a key clotting protein, which can cause abnormal bleeding episodes ranging from mild bruising to life-threatening internal hemorrhages.

Overview

Factor X deficiency is a rare bleeding disorder that varies in severity among affected individuals. The signs and symptoms of this condition can begin at any age, although the most severe cases are apparent in childhood. This condition occurs in approximately 1 per million individuals worldwide.

Symptoms

The symptoms of factor X deficiency can range from mild to severe and commonly include:

  • Nosebleeds
  • Easy bruising
  • Bleeding under the skin
  • Bleeding of the gums
  • Blood in the urine (hematuria)
  • Prolonged or excessive bleeding following surgery or trauma
  • Heavy or prolonged menstrual bleeding (menorrhagia) in women
  • Excessive bleeding during childbirth
  • Increased risk of pregnancy loss (miscarriage)
  • Bleeding into joint spaces (hemarthrosis)

In severe cases, individuals face an increased risk of life-threatening complications, including:

  • Bleeding inside the skull (intracranial hemorrhage)
  • Bleeding in the lungs (pulmonary hemorrhage)
  • Bleeding in the gastrointestinal tract

Causes & Risk Factors

Factor X deficiency can be inherited or acquired later in life:

Congenital Factor X Deficiency

The inherited form of the disorder is caused by mutations in the F10 gene, which provides instructions for making the coagulation factor X protein. This protein plays a critical role in the coagulation system, a series of chemical reactions that forms blood clots in response to injury. There are two types of congenital factor X deficiency:

  • Type I: Mutations reduce the overall amount of coagulation factor X in the bloodstream.
  • Type II: Mutations result in the production of an altered coagulation factor X protein with impaired function.

Acquired Factor X Deficiency

The non-inherited form, known as acquired factor X deficiency, is more common than the congenital form. It can be caused by:

  • Severe liver disease
  • Systemic amyloidosis (a condition involving the accumulation of abnormal proteins called amyloids)
  • Certain drugs, such as medicines that prevent clotting
  • A deficiency of vitamin K

Inheritance

When caused by mutations in the F10 gene, the condition is inherited in an autosomal recessive pattern. This means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Acquired factor X deficiency is not inherited and generally occurs in individuals with no history of the disorder in their family.

Other Names

  • Congenital Stuart factor deficiency
  • F10 deficiency
  • Stuart-Prower factor deficiency

Frequently Asked Questions

To minimize bleeding risks, avoid contact sports and activities with a high risk of injury. Use soft toothbrushes and avoid dental floss that could cause gum bleeding. Inform all healthcare providers, including dentists, about your condition before any procedures. Avoid medications that thin the blood, such as aspirin or NSAIDs, unless specifically approved by your hematologist. Regular, gentle exercise is generally safe and encouraged.
For individuals with congenital Factor X deficiency, genetic counseling is highly recommended to understand the inheritance pattern and the risk of passing the condition to children. Genetic testing can identify the specific F10 gene mutation in affected individuals and can be used for carrier testing in family members. This information helps families make informed decisions about family planning and reproductive options.
Seek emergency care immediately if you experience severe headaches, vision changes, confusion, or weakness on one side of the body, as these could indicate bleeding inside the skull. Difficulty breathing, coughing up blood, or severe chest pain may signal bleeding in the lungs. Black, tarry stools, vomiting blood, or severe abdominal pain could indicate gastrointestinal bleeding. These are life-threatening complications requiring urgent medical intervention.
The primary treatment for Factor X deficiency is replacement therapy, which involves infusing concentrated Factor X or fresh frozen plasma to temporarily increase clotting factor levels. This is crucial for managing acute bleeding episodes or as a preventive measure before surgeries or invasive procedures to reduce the risk of excessive bleeding. The specific product and dosage depend on the severity of the deficiency and the clinical situation.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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