Introduction: Deep vein thrombosis (DVT) is present in 10.6% patients after operative treatment for ovarian malignancy. We undertook the present study to find the risk factors for venous thromboembolism (VTE) after surgical treatment for ovarian cancer and to clarify the prognostic value of D-dimer and a positive PTP test (Wells score) in these patients. Material and Methods: A total of 31 consecutive patients with histologically confirmed ovarian cancer after surgery, clinically suspicious for DVT were followed from January 2006 to December 2008. All patients were operatively treated at the Clinical Center of Serbia. Study variables included age, cardiovascular disease, FIGO stage, histology, BMI, presence of massive ascites and tumor size, D-dimer level and Wells score. All patients were postoperatively administered anticoagulant therapy. Results: DVT was found in nine of 31 patients (29.0%). High BMI and presence of massive ascites were significantly associated with DVT. D-dimer (DD) levels were high in 27 of out 31 patients (87.1%). Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were 100, 18.2, 33.3 and 100%. Results of the PTP test (according to Wells score) was positive in 20 out of 31 patients (64.5%). PTP score was not significantly different in patients with or without VTE (p = 0.606). Sensitivity, specificity, PPV and NPV were 66.7, 36.4, 30.0 and 72.7%, respectively. Conclusion: Incidence of VTE after gynecological operations for ovarian cancer in our study was similar to other investigators. Obesity and the massive ascites are statistically significant risk factors. Measurement of DD level and ultrasonography could become the standard in predicting VTE in ovarian cancer surgery. The use of Wells score is not satisfying in these patients. Prediction of VTE after gynecological surgery needs further confirmation in randomized controlled trials.