a) Duplex ultrasound

Yes

The best answer. The top concern for this patient is a deep venous thrombosis (DVT). This is the most commonly used method of evaluation in the United States. In a patient where the pre-test probability is moderate or high, the sensitivity is > 95% at diagnosing a popliteal or femoral DVT. Sensitivity is lower for calf DVT or for assessment of an asymptomatic lower extremity.(2)

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