Pretest probability estimation in the evaluation of patients with possible deep vein thrombosis.

Introduction: An estimation of pretest probability is integral to the proper interpretation of a negative compression ultrasound in the diagnostic assessment of lower-extremity deep vein thrombosis. We sought to determine the rate, method, and predictors of pretest probability estimation in such patients.

Methods: This cross-sectional study of outpatients was conducted in a suburban community hospital in 2006.