Plasma D-dimers in the diagnosis of venous thromboembolism

Archives of Internal Medicine
James KellyB J Hunt

Abstract

Clinical suspicion for venous thromboembolism (VTE) mandates objective testing to confirm or exclude the diagnosis. However, current imaging modalities are imperfect because of a small but important risk of complications with invasive techniques or limited sensitivity with noninvasive ones. A diagnostic tool for VTE is needed that is noninvasive and highly accurate, allowing immediate treatment decisions to be made in most cases. Plasma D-dimers (D-ds), specific cross-linked fibrin derivatives, partially fulfill these criteria in that they are sensitive markers for thrombosis but lack specificity. They therefore cannot be used to make a positive diagnosis of VTE; however, they generally have high negative predictive value and are useful as an exclusionary test, a potentially important role given that VTE is eventually ruled out in most patients investigated. Clinical management studies are clarifying the role of D-ds in the diagnostic paradigm of VTE: negative ultrasound and D-d findings obviate the need for serial imaging in suspected deep vein thrombosis, and anticoagulant therapy can be safely withheld in patients with non-high clinical suspicion for pulmonary embolism and non-high probability ventilation perfusion scan if D...Continue Reading

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