A provider will use the following tests to make a PE diagnosis: Blood tests (including the D-dimer test). Computed tomography (CT) angiogram. Ultrasound of your leg. (This helps identify blood clots in people’s legs, or deep vein thrombosis, which can move to the lungs and become a PE and cause more damage.) A ventilation/perfusion (V/Q) scan, if you’re unable to get contrast for a CT scan. (This is a nuclear scan that can detect clots in your lung.) Other tests your provider may order include: Pulmonary angiogram. Chest X-ray.