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D-dimer test

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D-dimer test

A d-dimer test is a blood test that measures a substance (fibrin) that is released as a blood clot breaks up. D-dimer levels are often higher than normal in people who have a blood clot, but other conditions also may cause high d-dimer levels.

A low d-dimer test result means that a blood clot in the leg or the lung (pulmonary embolism) is unlikely.

Current as of: May 1, 2026

Author: WebMD Ignite Staff

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This information does not replace the advice of a doctor. WebMD Ignite, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

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