Recurrent VTE after stopping anticoagulants in patients with different APA profiles: patients with multiple tests positive and patients with persistent positivity are at increased risk for recurrent VTE. No APAs (all tests negative), any APAs (at least 1 test positive once), same APAs (positive test persistent for the same assay on 2 occasions), different APAs (multiple tests positive). See Figure 3 in the article by Kearon et al that begins on page 2151.