What is Factor V Leiden Mutation?

What is Factor V Leiden Mutation?

Factor V Leiden is a genetic mutation that affects the Factor V protein, which plays a role in blood clotting. In people with this mutation, the clotting process becomes more active than usual; “Clotting Tendency Increases.” Normally, Factor V, which causes clotting, is broken down by “activated protein C” (APC) after it has done its job and rendered ineffective. However, the Factor V protein becomes resistant to APC and is not broken down in this mutation. As a result, clotting continues, and excessive clotting (thrombosis) occurs in the vessel.

In Whom Is It Seen? Is It Genetic?

Factor V Leiden mutation is a genetic condition. The mutation can be passed from mother or father to child. It can occur in two ways:

• Heterozygous individual: Only one copy of the gene has a mutation. (More common in the population)

• Homozygous individual: There is mutation in both copies of the gene. (Rare but much higher risk)

The heterozygous carrier rate in individuals of European origin is approximately 5%, and homozygosity is less than 1%.

What Symptoms Can It Cause?

Individuals with the Factor V Leiden mutation often do not show symptoms. However, some people may develop clots, especially in the leg veins (deep veins) or the veins leading to the lungs.

Situations to be taken into consideration are:

• Deep vein thrombosis (DVT): Swelling, pain, increased temperature in the leg.
• Pulmonary embolism: Sudden shortness of breath, chest pain, rapid heartbeat.
• Recurrent miscarriages: Can especially lead to unexplained miscarriages.
• Pregnancy complications: Risks such as preeclampsia and placental abruption.
• The risk of clot formation increases after surgery or during prolonged inactivity.

Who Should Get Tested?

Not every individual needs to have genetic testing. However, testing is recommended in some cases:

• Deep vein clots that develop without a cause (DVT or pulmonary embolism at a young age)
• Those with a family history of blood clots
• Recurrent pregnancy loss
• Women who receive long-term hormone therapy
• Those who develop clots after long flights or surgery

The test is performed by genetic analysis of a blood sample and can definitively determine whether you carry the Factor V Leiden mutation.

What Should Those With Factor V Leiden Mutation Do?

If you carry this mutation, the first thing you need to do is follow up with your doctor regularly. Heterozygous carriers have a lower risk of blood clots, while homozygous carriers require stricter precautions.

Precautions to take:

• Be careful not to remain inactive for long periods of time (air travel, desk work, etc.)
• If necessary, use of blood thinners (anticoagulant) medication can be planned.
• The doctor must be informed before pregnancy.
• Estrogen-containing drugs, such as birth control pills, increase clot formation and can be risky.
• If you have a planned surgery, be sure to inform your doctor about this mutation beforehand.

Remember, Factor V Leiden mutation is a lifelong risk but manageable condition.

Is Treatment Necessary?

The mutation itself cannot be treated because it is a genetic condition. However, clots that may occur due to the mutation can be prevented or treated. Anticoagulant drugs, i.e. blood thinners, are used as preventive treatment. This decision is made by the doctor based on your personal risk factors.