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Introduction:The Villalta scale is the endorsed tool to diagnose and grade the severity of post thrombotic syndrome (PTS); however, assessing presence and severity of PTS is time consuming and relies on both the clinician and patient's assessments. The patient reported Villalta scale version 2 (PRV2) is a visually assisted form that enables patients to self-assess presence and severity of PTS. Herein, we report on external validation of this tool. Methods: We assessed the agreement and kappa values of PRV2 to diagnose and assess severity of PTS compared with the original Villalta score in a cohort of 181 patients (196 limbs) who participated in the SAVER Pilot randomized control trial. Presence of PTS was defined as PRV2≥5 or a Villalta score≥5.Results: PTS prevalence was 42% using PRV2 and 33% using Villalta scale. The corresponding kappa and percentage agreement were 0.60 (95% CI: 0.49 to 0.71) and 81% (95% CI: 76 to 87) respectively. Kappa values and percentage agreements between PRV2 and Villalta scale increased

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