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Living with Thrombophilia due to thrombin defect

An inherited condition (prothrombin thrombophilia) that raises the chance of forming harmful blood clots.

Understanding Thrombophilia due to thrombin defect

Thrombophilia due to thrombin defect, also called prothrombin thrombophilia, is an inherited condition that raises the risk of blood clots.

Clots can form when they are not needed and block blood flow. People have a higher risk of deep vein thrombosis, usually in the arms or legs, and of pulmonary embolism, a clot in the lungs. Many people never have a clot. Risk goes up with surgery, injury, air travel, obesity, family history, pregnancy, estrogen-containing birth control, or hormone therapy after menopause.

Signs & symptoms

GARD doesn't list specific symptoms for this condition yet. The main concern is blood clots:

  • Deep vein blood clot (deep vein thrombosis)
  • Blood clot in the lungs (pulmonary embolism)

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Your doctor may refer you to a specialist who knows rare conditions.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

Care & treatment

Care team
A doctor familiar with rare conditions, plus specialists as needed
Expert care
Ask about multidisciplinary care centers for rare conditions
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with National Blood Clot Alliance
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
What things in my life raise my risk of clots?
Should I take special steps for surgery, travel, or pregnancy?
Should other family members be tested?

Quick facts

InheritanceAutosomal Dominant

GARD says this condition is autosomal dominant, which means one changed copy of a gene can be enough to cause it. It doesn't name a specific gene in this record.

Also known as: factor v r2 mutation thrombophilia; prothrombin thrombophilia; prothrombin-related thrombophilia; prothrombin-related thrombophilia (factor ii); thph1; thrombophilia 1 due to thrombin defect

Patient organizations

Source: NIH GARD · Thrombophilia due to thrombin defectGARD ID 10815 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with Thrombophilia due to thrombin defect.

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