"The revised PIOPED criteria for the diagnosis of pulmonary embolus indicate the probability of pulmonary emboli based on findings on V/Q scan (ventilation-perfusion scintigraphy)."
"One moderate to two large mismatched segmental perfusion defects or the arithmetic equivalent of moderate and/or large defects"
Expected headings
"High probability (≥80%)"
"Borderline high probability"
"Intermediate probability (20-79%)"
"Borderline low probability"
"Low probability (≤19%)"
"Normal"
"nonsegmental perfusion defects (e.g. pleural effusion, cardiomegaly, elevated diaphragm, ectatic aorta, enlarged hila)"
"no perfusion defects; perfusion scan exactly outlines the shape of the lungs on chest radiograph"