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Definition of D-dimer

D-dimer: A fragment produced during the degradation of a clot. The D here stands for domain. Dimer indicates two identical units, in this case two identical domains. D-dimer result from complete breakdown of the clot. Monoclonal antibody to the D-dimer fragment provide the basis for the main methods of detecting it. The presence of D-dimers in the blood is a reliable clue that clotting has begun. Sometimes used as a clinical marker for pulmonary embolism (blood clot in the lung) or deep venous thrombosis (DVT) (blood clot in the leg) Sometimes written d-dimer or D-Dimer

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=24476
Last Editorial Review: 9/20/2012

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