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WARFARIN RESPONSE TESTING

What Is Warfarin?

Warfarin (brand name Coumadin®) is the most commonly used prescription medication for preventing harmful blood clots from forming or from growing larger. Warfarin belongs to a class of drugs called anticoagulants, which simply means medications that prevent the blood from clotting. People often call anticoagulants "blood thinners."

It is vital that our bodies can form blood clots to control bleeding. However, there are many medical conditions and inherited factors that may increase a person's tendency to form abnormal blood clots. Abnormal blood clots may be dangerous because they can block the flow of blood to parts of the body such as the heart, lungs, or brain.

Some conditions that are treated with warfarin on a short-term or long-term basis include:

  • Irregular heartbeat
  • Heart valve replacement
  • Previous heart attack or stroke
  • Blood clot in a vein (venous thrombosis or deep vein thrombosis)
  • Blood clot in the lung (pulmonary embolism)
  • Certain orthopedic surgeries, such as knee or hip replacement
  • Inherited blood clotting disorders, such as Factor V Leiden

Anyone who has a higher-than-average risk for abnormal blood clots may be treated with warfarin.

For more information, read the MedlinePlus Warfarin Fact Sheet.

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