Pain assessment has a key role in relief of the postoperative pain. In this study, we aimed to examine the effect of the Standard Pain Assessment Protocol (SPAP), which we developed based on acute pain guidelines, on pain level, and analgesic consumption. The study population consisted of a total of 101 patients who had arthroscopic shoulder surgery. The routine pain assessment was administered to the control group, while the SPAP was administered to the study group. The routine pain therapy of the clinic was administered to the subjects from both groups based on the pain assessment. Throughout the study, pain was assessed nearly two times more in the study group (p < 0.001) and the mean pain levels were lower at 8th-11th hours in the study group (p < 0.001). Pain assessment was not performed after 12th hour despite the severe pain in the control group, and, therefore, analgesia was administered at irregular intervals or was not administered at all. However, the hours of analgesic administration were found to be more regular according to the pain levels of the patients in the study group. In conclusion, the SPAP reduced the pain level by providing regular analgesia when used in combination with regular pain assessment.