Aims: To evaluate the diagnostic significance of the novel index combining preoperative hemoglobin, albumin levels, lymphocyte and platelet counts (HALP) in prostate cancer (PCa) patients. Methods: Between January 1, 2015 to December 31, 2018 at the Hitit University Erol Olçok Education and Research Hospital 225 patients who had undergone transrectal ultrasound guided prostate biopsy or prostate surgery were analyzed retrospectively. A total of patients; 155 had benign prostate hyperplasia (group 1) and 70 had PCa (group 2). The preoperative serum levels of hemoglobin, albumin, lymphocyte counts, and platelet counts were recorded. The HALP scores and the sub parameters of this index for each of the two groups were compared. Results: The total Prostate Specific Antigen (PSA), albumin and lymphocyte differences between the groups were statistically significant (p=0.0002, p=0.0001, p= 0.005). The median value of HALP scores in Group 1 and 2 were 49.43 and 51.2 respectively, and this was not statistically significant between groups (p=0.737). The HALP score had the least Area Under Curve (AUC) value compared to the others (0.514). the AUC of Albumin was larger than PSA for diagnostic efficacy in PCa patients (0.696-0.656). However, albumin levels were statistically significant compared to platelet count and the HALP score (p=0.0033, p=0.0068), except PSA and lymphocyte (p=0.4580, p=0.1717). Conclusion:Further prospective clinical studies that include more patients from multiple centers are needed to show the diagnostic role of the HALP score and its compounds on the patients with PCa.