Trachil made recommendations for the diagnosis of recurrent deep vein thrombosis (DVT). The author is from the University of Liverpool.

A recurrent deep vein thrombosis can be diagnosed if:

(1) comparison of old and new ultrasound scans shows a thrombus that has increased in length with an increase in vein diameter

(2) serial ultrasound scans show a thrombus increasing in length with an elevated plasma D-dimer concentration

(3) positive MR (magnetic resonance) venography

(4) venous non-compressibility in a new venous distribution


Resolution of a previous thrombus can take several months so persistence of thrombus alone is not a sufficient criterion.

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