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Factor V Leiden: Mutation, Symptoms and Treatment

Factor V Leiden is a genetic mutation that increases the risk of blood clots. It is the most common hereditary cause of excessive blood clotting (thrombophilia).

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Things worth knowing about "Leiden factor 5"

Factor V Leiden is a genetic mutation that increases the risk of blood clots. It is the most common hereditary cause of excessive blood clotting (thrombophilia).

What is Factor V Leiden?

Factor V Leiden (also referred to as the Factor 5 Leiden mutation) is a genetic variant of coagulation factor V that leads to an increased tendency to form blood clots, a condition known as thrombophilia. It is the most common inherited thrombophilia in populations of European descent, affecting approximately 3–8 % of people in Central and Northern Europe.

Causes and Genetics

The mutation is caused by a single point change in the F5 gene on chromosome 1, where the amino acid arginine at position 506 is replaced by glutamine (R506Q). As a result, the clotting protein Factor V can no longer be properly inactivated by the natural anticoagulant enzyme Activated Protein C (APC) – a condition called APC resistance.

Heterozygous carriers: One mutated copy of the gene (inherited from one parent) – the risk of thrombosis is increased 4–8 times.
Homozygous carriers: Two mutated copies (inherited from both parents) – the risk of thrombosis is increased 50–80 times.

Symptoms and Complications

Many people with Factor V Leiden never experience symptoms. However, when a blood clot does form, the following may occur:

Deep vein thrombosis (DVT): Swelling, pain, redness, and warmth, most often in the leg
Pulmonary embolism: Sudden shortness of breath, chest pain, coughing, or rapid heartbeat (medical emergency)
Thrombosis in unusual locations: Such as in liver, spleen, or brain veins
Pregnancy complications: Increased risk of miscarriage, pre-eclampsia, or placental insufficiency

Diagnosis

Diagnosis is established through laboratory testing:

APC resistance test: A functional coagulation test that measures how the blood responds to activated protein C. In Factor V Leiden, the inhibitory effect is reduced.
Genetic testing (DNA analysis): Confirms the specific mutation in the F5 gene and distinguishes between heterozygous and homozygous carrier status.
Testing is recommended for individuals with an unexplained first thrombosis, a positive family history, or thrombosis during pregnancy.

Treatment and Management

Not all carriers of the Factor V Leiden mutation require treatment. Therapy is tailored to the individual risk profile:

Medical Treatment

Anticoagulants (blood thinners): For acute thrombosis, heparin or direct oral anticoagulants (DOACs) such as rivaroxaban or apixaban are used.
Long-term anticoagulation: Individuals with recurrent thrombosis or very high risk may require ongoing treatment.

Preventive Measures

Avoiding additional risk factors such as smoking, obesity, and prolonged immobility
Thrombosis prophylaxis during surgery or long-haul flights
Special monitoring and anticoagulation during pregnancy if indicated
Caution with hormonal contraceptives (the pill), which can further increase clotting risk

References

Rosendaal FR, Koster T, Vandenbroucke JP, Reitsma PH. High risk of thrombosis in patients homozygous for factor V Leiden (activated protein C resistance). Blood. 1995;85(6):1504–1508.
World Health Organization (WHO). Thrombosis and Haemostasis. WHO Technical Report Series. Geneva, 2023.
Middeldorp S. Factor V Leiden and the risk of venous thromboembolism. Hematology Am Soc Hematol Educ Program. 2011;2011:301–306.

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