Which imaging test is most commonly used to definitively diagnose PE in contemporary practice?

Which imaging test is most commonly used to definitively diagnose PE in contemporary practice?

• A. V/Q scan
• B. Pulmonary angiography
• C. CXR
• D. CT Angiography

Answer: (D)

CT pulmonary angiography is the imaging study most commonly used today to definitively diagnose pulmonary embolism. It directly visualizes clots within the pulmonary arteries and can also reveal alternative causes of symptoms, all in a rapid, widely available, and noninvasive test. Modern multidetector CTA has high sensitivity and specificity, making it the go-to test to confirm or exclude PE in most patients without needing invasive procedures. V/Q scanning can be helpful when contrast is a concern (such as iodine allergy or pregnancy), but its results are more often nondiagnostic or indeterminate, which makes it less definitive in routine practice. Pulmonary angiography is the historical gold standard but is invasive and carries more risk, so CTA has largely replaced it as the initial diagnostic tool. Chest X-ray, while useful to rule out other causes, does not diagnose PE.

CT pulmonary angiography is the imaging study most commonly used today to definitively diagnose pulmonary embolism. It directly visualizes clots within the pulmonary arteries and can also reveal alternative causes of symptoms, all in a rapid, widely available, and noninvasive test. Modern multidetector CTA has high sensitivity and specificity, making it the go-to test to confirm or exclude PE in most patients without needing invasive procedures.

V/Q scanning can be helpful when contrast is a concern (such as iodine allergy or pregnancy), but its results are more often nondiagnostic or indeterminate, which makes it less definitive in routine practice. Pulmonary angiography is the historical gold standard but is invasive and carries more risk, so CTA has largely replaced it as the initial diagnostic tool. Chest X-ray, while useful to rule out other causes, does not diagnose PE.