What additional diagnostic test should be ordered along with a venous ultrasound for a patient with a swollen calf?

Ordering a thrombophilia panel alongside a venous ultrasound for a patient with a swollen calf is appropriate because it directly addresses the concern of potential venous thrombosis, which could result in the patient's symptoms. When a swollen calf is present, particularly if deep vein thrombosis (DVT) is suspected, understanding the underlying predisposition to clotting disorders is crucial. A thrombophilia panel evaluates the patient's risk for hypercoagulable states and can uncover factors such as inherited clotting disorders or acquired conditions that could contribute to the formation of thrombi. If a DVT is confirmed via ultrasound, identifying these risk factors allows for tailored anticoagulation therapy and further management to prevent recurrence.

Ordering a complete blood count could provide information about overall health but would not directly address the specific concerns related to thrombosis. A liver function test might be beneficial for assessing hepatic function but does not correlate with diagnosing conditions associated with swelling and potential thrombosis. Similarly, a chest X-ray would not provide relevant information regarding a swollen calf; it is primarily used to evaluate pulmonary issues or cardiac conditions, which are not the primary concerns in this scenario.