Correlation Between Computer Tomography Angiography and D-Dimer Level for the Diagnosis of Pulmonary Embolism

CTPA was performed after performing blood sampling using Siemens Somatom definition AS 24 slice scanners. Non-ionic water-soluble contrast Omnipaque 350 mg I/mg or Visipaque 320 mg I/mg was injected at 4 mm/s maximum dose 100 ml using a Medtron pressure injector.OR, A blood sample was taken before starting the patients on any thrombolytic treatment. The latex agglutination test was used to measure plasma D-dimer level; this was done using a Sysmex CA-7000 automatic coagulation unit. The positivity threshold was above 250 ng/ml.