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Table 4 Combination of clinical probability and PetCO2 measurement in patients with positive D-dimer and suspected pulmonary embolism

From: Capnometry in suspected pulmonary embolism with positive D-dimer in the field

Combinations PE No PE
PE likely
OR
PetCO2 < 28 mmHg
(suggests PE possible)
41 24
PE unlikely
AND
PetCO2 > 28 mmHg
(Rule out PE)
0 35
PE likely
AND
PetCO2 < 28 mmHg
(suggests PE possible)
24 4
PE unlikely
OR
PetCO2 > 28 mmHg
(Rule out PE)
17 55
  1. PE = pulmonary embolism; PetCO2 = partial pressure of end-tidal carbon dioxide.