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How is factor V Leiden diagnosed?

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Your doctor will ask about your medical history and any clots you or any family members may have had. Your doctor probably will want to take a sample of your blood for a test called a coagulation screening test. This can tell if your blood works against the protein that helps control factor V. If the results aren't clear, your doctor might recommend a genetic test to help confirm your diagnosis. This is typically done with a sample of your blood. It can tell you if you have the factor V problem gene and if you got it from one or both parents.

SOURCES:

American Society of Hematology: "Blood Clots."

CDC: "Venous Thromboembolism (Blood Clots)."

GeneFacts: "Factor V Leiden-associated Thrombosis."

Mayo Clinic: "Factor V Leiden."

National Blood Clot Alliance: "Factor V Leiden Resources."

National Human Genome Research Institute: "Learning About Factor V Leiden Thrombophilia."

NIH U.S. National Library of Medicine Genetics Home Reference: "factor V Leiden thrombophilia."

World Federation of Hemophilia: "What are rare clotting factor deficiencies?

Reviewed by Nayana Ambardekar on July 15, 2018

SOURCES:

American Society of Hematology: "Blood Clots."

CDC: "Venous Thromboembolism (Blood Clots)."

GeneFacts: "Factor V Leiden-associated Thrombosis."

Mayo Clinic: "Factor V Leiden."

National Blood Clot Alliance: "Factor V Leiden Resources."

National Human Genome Research Institute: "Learning About Factor V Leiden Thrombophilia."

NIH U.S. National Library of Medicine Genetics Home Reference: "factor V Leiden thrombophilia."

World Federation of Hemophilia: "What are rare clotting factor deficiencies?

Reviewed by Nayana Ambardekar on July 15, 2018

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Who is at risk for factor V Leiden?

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