We would like to thank Laroche et al. for their thoughtful comments and interest in our study (1) . As suggested by Laroche et al. the only real danger of imaging the asymptomatic leg lies in the false positive tests. However, we respectfully disagree that the risk of false positive tests is similar in both legs. Indeed, our retrospective study suggests that a proximal deep vein thrombosis is found in approx. 0.1% of asymptomatic (2 out of 2804), as compared with 22% of symptomatic legs (2) . This article is protected by copyright. All rights reserved.