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

Updated: Jun 06, 2019
  • Author: Daniel R Ouellette, MD, FCCP; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Answer

Low probability criteria are as follows:

  • Multiple matched V/Q defects, regardless of size, with normal chest radiographic findings

  • Corresponding V/Q defects and radiographic parenchymal opacity in upper or middle lung zone

  • Corresponding V/Q defects and large pleural effusion

  • Any perfusion defects with substantially larger radiographic abnormality

  • Defects surrounded by normally perfused lung (stripe sign)

  • More than three small (< 25% of a segment) segmental perfusion defects with normal chest radiographic findings

  • Nonsegmental perfusion defects (cardiomegaly, aortic impression, enlarged hila)


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