PE testing. If your history is strongly suggestive that you might have a pulmonary embolism-pe, then a blood test called a d-dimer might be ordered. If that is low, you don't have a clot. If high, the gold standard of testing for a pe is a spiral cat scan of the lungs with infusion. Ventilation-perfusion scans and pulmonary angiography are done infrequently these days as long as a ct scan can be done.