Ventilation-perfusion scan also referred to as lung scintigraphy or commonly V/Q scan, is a diagnostic test utilizing radioisotopes to evaluate pulmonary ventilation and perfusion.
While CT pulmonary angiography is currently considered the gold standard and is one of the most commonly used modalities for diagnosing pulmonary embolism, a V/Q scan is useful in assessing the likelihood of pulmonary embolism when intravenous contrast is contraindicated, such as in acute or chronic kidney disease and intravenous contrast allergy.
