A ventilation/perfusion lung scan, also called a V/Q lung scan, or ventilation/perfusion scintigraphy, is a type of medical imaging using scintigraphy and medical isotopes to evaluate the circulation of air and blood within a patient's lungs, in order to determine the ventilation/perfusion ratio
A negative D-dimer test reliably excludes Pulmonary Embolism in patients with a low clinical probability of Pulmonary Embolism 1) or in those with nondiagnostic Ventilation/perfusion scan 2).