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Doppler ultrasound is the preferred method for diagnosing deep vein thrombosis (DVT). It has high specificity and sensitivity for detecting thrombi in the proximal leg veins. Isolated calf vein thrombi can be missed by Doppler in up to 30% of cases. Clinical evaluation alone is only positive for DVT in about 50% of cases. While D-dimer tests are sensitive, they are not specific for DVT. Doppler ultrasound can directly visualize thrombi as noncompressible segments within veins. Indirect signs…