Warfarin Sensitivity Testing

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Also known as: Warfarin Sensitivity Genotyping
Formal name: CYP2C9 Genotype; VKORC1 Genotype

At a Glance

Why Get Tested?

To determine whether you have CYP2C9 and/or VKORC1 genetic variations and are likely to need lower, or less commonly, higher than average doses of the anticoagulant drug warfarin

When to Get Tested?

A health practitioner might order this test prior to prescribing warfarin for you if there is a history of warfarin resistance in your family, or more commonly, a health practitioner may sometimes order it when you are being treated with warfarin and have had bleeding or clotting episodes or difficulties in achieving a therapeutic dose of warfarin as determined by blood monitoring.

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?