We appreciate comments by Dr Sharma and his colleagues concerning the clinical relevance of our study.1 The diagnostic accuracy of duplex ultrasound scanning for acute DVT in our institution was established by comparison with contrast venography at routine Quality Assurance reviews during the period prior to the initiation of this prospective surveillance study. As noted in the seventh paragraph of the "Comment" section,2 this comparison was performed almost entirely in patients with symptoms. At that time, duplex ultrasound scanning was an evolving technique for application to the diagnosis of acute venous thrombosis, and we thought that it was essential to achieve an acceptable baseline accuracy prior to employing this technique in a prospective fashion. The details of the diagnostic accuracy in our laboratory and the details of duplex ultrasound scan diagnostic criteria for acute DVT were described in our preliminary article2 in 1989.
Flinn WR. Prospective Surveillance for Perioperative Venous Thrombosis-Reply. Arch Surg. 1997;132(2):212-213. doi:10.1001/archsurg.1997.01430260110025