What is Factor V Leiden?
Factor V Leiden is a mutation of one of the clotting factors in the blood. (1)
Factor V Leiden is pronounced (FAK-tur five LIDE-n). (1)

Most people with factor v Leiden never develop abnormal clots. (1)
Women who carry the factor V Leiden mutation may have increased tendency to develop blood clots during pregnancy or when taking estrogen. (1)

What does Factor V Leiden do?
increases the chance of developing abnormal blood clots, most commonly in the legs or lungs. (1)
may develop an abnormal blood clot (1)

What does Factor V Leiden NOT do?
it does not cause any symptoms (1)

Resources
1. https://www.mayoclinic.org/diseases-conditions/factor-v-leiden/symptoms-causes/syc-20372423

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