Evaluation of D-Dimer in the Diagnosis of Suspected Deep-Vein Thrombosis
Philip S. Wells, M.D., David R. Anderson, M.D., Marc Rodger, M.D., Melissa Forgie, M.D., Clive Kearon, M.D., Ph.D., Jonathan Dreyer, M.D., George Kovacs, M.D., Michael Mitchell, M.D., Bernard Lewandowski, M.D., and Michael J. Kovacs, M.D.
Background Several diagnostic strategies using ultrasound imaging,measurement of D-dimer, and assessment of clinical probabilityof disease have proved safe in patients with suspected deep-veinthrombosis, but they have not been compared in randomized trials.
Methods Outpatients presenting with suspected lower-extremitydeep-vein thrombosis were potentially eligible. Using a clinicalmodel, physicians evaluated the patients and categorized themas likely or unlikely to have deep-vein thrombosis. The patientswere then randomly assigned to undergo ultrasound imaging alone(control group) or to undergo D-dimer testing (D-dimer group)followed by ultrasound imaging unless the D-dimer test was negativeand the patient was considered clinically unlikely to have deep-veinthrombosis, in which case ultrasound imaging was not performed.
Results Five hundred thirty patients were randomly assignedto the control group, and 566 to the D-dimer group. The overallprevalence of deep-vein thrombosis or pulmonary embolism was15.7 percent. Among patients for whom deep-vein thrombosis hadbeen ruled out by the initial diagnostic strategy, there weretwo confirmed venous thromboembolic events in the D-dimer group(0.4 percent; 95 percent confidence interval, 0.05 to 1.5 percent)and six events in the control group (1.4 percent; 95 percentconfidence interval, 0.5 to 2.9 percent; P=0.16) during threemonths of follow-up. The use of D-dimer testing resulted ina significant reduction in the use of ultrasonography, froma mean of 1.34 tests per patient in the control group to 0.78in the D-dimer group (P=0.008). Two hundred eighteen patients(39 percent) in the D-dimer group did not require ultrasoundimaging.
Conclusions Deep-vein thrombosis can be ruled out in a patientwho is judged clinically unlikely to have deep-vein thrombosisand who has a negative D-dimer test. Ultrasound testing canbe safely omitted in such patients.
Source Information
From the Departments of Medicine, Radiology, and Emergency Medicine, Ottawa Hospital, University of Ottawa, Ottawa, Ont. (P.S.W., M.R., M.F., B.L.); Queen Elizabeth II Health Sciences Centre, Dalhousie University, Halifax, N.S. (D.R.A., G.K., M.M.); London Health Sciences Centre, University of Western Ontario, London, Ont. (J.D.); and Henderson Hospital, McMaster University, Hamilton, Ont. (C.K.) all in Canada.
Address reprint requests to Dr. Wells at Ottawa Hospital Civic Campus, Suite F647, 1053 Carling Ave., Ottawa, ON K1Y 4E9, Canada, or at pwells{at}ohri.ca.
Rodger, M. A. MD MSc, Kahn, S. R. MD MSc, Wells, P. S. MD MSc, Anderson, D. A. MD, Chagnon, I. MD, Le Gal, G. MD PhD, Solymoss, S. MD, Crowther, M. MD, Perrier, A. MD, White, R. MD, Vickars, L. MD, Ramsay, T. PhD MSc, Betancourt, M. T. MD MSc, Kovacs, M. J. MD
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