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
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A negative [[D-dimer]] test reliably excludes [[Pulmonary Embolism]] in patients with a low clinical probability of [[Pulmonary Embolism]]
((Wells PS, Ginsberg JS, Anderson DR, et al. Use of a
Clinical Model for Safe Management of Patients
with Suspected Pulmonary Embolism. Ann Intern
Med. 1998; 129:997–1005))
or in those with nondiagnostic [[Ventilation/perfusion scan]]
((Ginsberg JS, Wells PS, Kearon C, et al. Sensitivity
and Specificity of a Rapid Whole-Blood Assay for Ddimer
in the Diagnosis of Pulmonary Embolism.
Ann Intern Med. 1998; 129:1006–1011)).