Aim: The aim of this study is to determine the rates of rapid antigen detection test use, test results and its relationship with Modified Centor Score and investigate the effect of rapid antigen detection test use on prescribing behaviour. Methods: This research was conducted by scanning the family physicians’ information system retrospectively. From the Family Medicine Information System, where polyclinics and prescription records of the family health centers where 12 family physicians work in Kayseri are located, the number and results of rapid antigen detection tests performed between February 2017 and April 2019, the Modified Centor Score automatically calculated by the system, the number of prescribed antibiotics and symptomatic treatment information was recorded. Results: The positivity of rapid antigen detection test was considered, cut-off value of Modified Centor Score was >2 (ROC EAA:63.9, Cl:0.95,0.61-0.66). Sensitivity rate of the test for diagnostic score was 86% and selectivity rate was 48.8%. Conclusion: Family physicians should be encouraged to use rapid antigen detection test. The fact that antibiotics are prescribed in rapid antigen detection testnegative patients may indicate that confidence level of the test is less than physical examination and clinical findings. Keywords: sore throat, primary care, score