What diagnostic test is frequently used to confirm a suspected pulmonary embolism?

CT pulmonary angiography is the preferred diagnostic test for confirming a suspected pulmonary embolism due to its high sensitivity and specificity in visualizing blood clots within the pulmonary arteries. This imaging technique involves the use of computed tomography combined with a contrast dye to provide detailed images of the blood vessels in the lungs, allowing for direct visualization of any emboli.

In cases of suspected pulmonary embolism, timely and accurate diagnosis is crucial because the condition can rapidly become life-threatening. While chest X-rays can provide initial information regarding lung complications, they are not effective in directly visualizing blood clots. Magnetic resonance imaging, while useful for some vascular assessments, is not typically utilized in the acute setting for pulmonary embolism due to longer acquisition times and lesser availability in emergency situations. Ultrasound of the leg veins might be used to identify deep vein thrombosis, which can be a source of pulmonary embolism, but it does not directly confirm the presence of an embolism in the lungs.

Thus, CT pulmonary angiography excels in accurately diagnosing pulmonary embolism, making it the diagnostic test of choice for this critical condition.