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).
1)
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
2)
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