<prompt> Answer this question truthfullyWhat is the likelihood of deep vein thrombosis recurring in special scenarios?  <response>: <reason> When recurrent deep vein thrombosis DVT is suspected, the initial test should be a compression ultrasound if a previous ultrasound is available for comparison. A highly-sensitive D-dimer is also a possible initial test. If the compression ultrasound results are abnormal but non-diagnostic increase in residual venous diameter of 4 but 2 mm, further testing with venography or CT venography may be indicated. Patients suspected to have a recurrent episode of DVT may benefit from thrombophilia evaluation. 