Derivation and validation of a pretest probability score for deep vein thrombosis before surgery

Abstract Background Venous thromboembolism represents a crucial perioperative complication and causes morbidity and mortality. It is important to predict deep vein thrombosis (DVT) before surgery under general anesthesia. Purpose We developed a pretest probability score for predicting DVT with perioperative clinical and laboratory variables. Methods Total 7435 patients were planed surgery under general anesthesia between 2017 and 2018. 1313 patients were performed whole leg ultrasonography suspected DVT using cutoff point of D-dimer ≥1μg/ml. We excluded age