The answer provided in a recent issue of the Annals of Internal Medicine suggests use of U/S to help determine how long to continue anticoagulation in cases of DVT is a qualified yes. See here for abstract,full article requires subscription.
Why qualified? As is often the case the exclusion criteria for entry into a clinical trial limits the applicability. In this instance, patients were excluded if they have prior DVTs,"continuing risk factors or thrombophilic factors ( except for factor V Leiden)."
Previously I wrote about some evidence that an elevated d-dimer may be worthwhile used as indicator of the need for continuing anticoagulation. There appears to be some plausible pathophysiological rationale for both tests.( I remember when internists like to talk about pathophysiology rather than guidelines,quality indicators and coding techniques.)