Background: In the diagnosis of prostatic diseases, the need for markers other than prostate specific antigen (PSA) has been increasing in recent years. So, we aimed to determine the predictive value, the neutrophil lymphocyte ratio, platelet-to-lymphocyte ratio and mean platelet volume before prostate biopsy in predicting the results of pathology. Transrectal ultrasound-guided biopsy of the prostate was performed because of high PSA values and compared values of these parameters to predict of pathology results. Methods: 2715 patients who underwent 10-12 quadrant transrectal ultrasound-guided prostate biopsies between January 2008 and January 2018 have been evaluated retrospectively. Patients were divided into groups according to the biopsy pathology results by benign (group 1), atypical small acinar proliferation (ASAP) (group 2) and prostate cancer (group 3). A total of 204 patients who were benign prostate hyperplasia in 71 patients (34.8%), atypical small acinar proliferation in 80 (39.21%) and prostate adenocarcinoma (PCa) in 53 patients (25.98%) were included in the study by systematic sampling. Before the biopsy total PSA (tPSA), free PSA (fPSA), rate of percentage of free to total prostate specific antigen (f/tPSA) rate, PSA density (PSA-D), white blood cell (WBC) count, blood neutrophil count (NC), blood lymphocyte count (LC), neutrophil lymphocyte ratio (NLR), mean platelet volume (MPV), platelet count (PLT) and platelet-to-lymphocyte ratio (PLR) were measured and compared in all groups. Differences in continuous variables were assessed using the ANOVA. Logistic regression was used to analyze the linear relationship between predictive variables and pathology results. P < 0.05 was considered statistically significant. Results: NLR and PLR values were lower in group 1 than group 2 and were found statistically significant between in group 1 and group 2 (p: 0.03 and p: 0.02, respectively). MPV value was found 1.7 times higher in patients who were diagnosed with ASAP pathology than