D-dimer test for deep vein thrombosis

A d-dimer test is a blood test that measures a substance released as a blood clot breaks up. D-dimer levels are often higher than normal in people who have a blood clot.

This blood test may be used to help diagnose a blood clot in the leg (deep vein thrombosis).

This test may be used to check your risk of a blood clot in a lung (pulmonary embolism) after you stop taking anticoagulants. The test can help your doctor decide if you should not take anticoagulants anymore or if you should start taking them again.

A low d-dimer test result may mean that a deep vein thrombosis or pulmonary embolism is less likely. A high d-dimer test result may not always be caused by a blood clot in the leg or lung.

Last Updated: January 5, 2010

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