What are the very low-probability criteria, or normal findings, for V/Q scanning diagnosis of pulmonary embolism (PE)?

Updated: Sep 18, 2020
  • Author: Daniel R Ouellette, MD, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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The normal finding is the presence of no perfusion defects and perfusion outlines the shape of the lung seen on a chest radiograph.

The very low–probability criterion is the presence of three small (< 25% of a segment) segmental perfusion defects with normal chest radiographic findings.

In the PIOPED II study, very low–probability V/Q scans in patients whose Wells score indicated low pretest probability of pulmonary embolism reliably excluded pulmonary embolism. [75]

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