Background: Ovarian torsion is a rare gynecologic emergency which diagnosis may be overlooked. Clinic is nonspecific, and there are no reliable laboratory methods to confirm the preoperative diagnosis. Usually, the diagnosis is confirmed during surgery. Objective: The aim of the study is to investigate the availability of diagnostic value neutrophil/lymphocyte ratio (NLR), platelet/lymphocyte ratio (PLR) and plateletcrit (PCT) values of ovarian torsion cases. Methodology: The preoperative hematologic values of 36 ovarian torsion cases which were operated and histopathologically confirmed were compared with 135 control cases. Results: NLR value of the study group was significantly higher than the control group (p=0.001). There were no significant difference in PLR and PCT values (p>0.05). Cut-off value of the NLR was found to be 3.10. This value corresponds to 83.33% sensitivity, 84.44% specificity, 58.80% positive predictive value (PPV) and 95% negative predictive value (NPV). Conclusion: Three and above value of NLR can be used as a hematological marker for the diagnosis of ovarian torsion.