SPEX Practice Test 7

A 68-year-old woman is in the hospital on day 8 of treatment for community-acquired pneumonia. She has received intravenous ceftriaxone and azithromycin, and subcutaneous unfractionated heparin for venous thromboembolism prophylaxis since admission. She had no previous heparin exposure. Her fever resolved on day 3. Today, her right calf is swollen and tender. Temperature is 36.9°C (98.4°F), pulse is 92/min, respirations are 18/min, and blood pressure is 132/78 mm Hg. There is no bleeding, and there are no petechiae. Hemoglobin concentration is stable at 12.1 g/dL, and INR is 1.1. Compression ultrasonography shows thrombosis of the right popliteal vein. Her daily platelet counts are shown.