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Title: Evaluation of diagnostic value of SARS-CoV-2 rapid diagnostic test in patients with Covid-19 Introduction: The standard RT-PCR test is a time-consuming diagnostic test with difficult accessibility and high cost, so in order to early diagnose and prevent the spread of Covid-19 disease, access to a quick, inexpensive diagnostic test with easy access is essential. This study aimed to evaluate diagnostic value of SARS-CoV-2 rapid diagnostic test in patients with Covid-19. Materials & Methods: The present study is a cross-sectional study in type of diagnostic value that was performed on 188 patients with symptoms of Covid-19 referred to the emergency department of Imam Hossein and Shohadaye Tajrish hospitals in Tehran. In this study, SARS-CoV-2 rapid diagnostic test was performed immediately after sampling and according to the manufacturer's instructions (reading in 10 minutes). Then chest CT scan was performed less immediately after collecting samples to compare with the results of rapid antigen detection test. Data were collected and analyzed using Spss software V.26 and descriptive-mean and Chi-square statistical tests. Results: Results showed that out of 83 patients who were diagnosed with Covid-19 positively based on rapid diagnostic test, all of them (100%) were also positive based on chest CT scan results, and out of 100 patients diagnosed Covid-19 negative based on rapid diagnostic test, 42 patients (42%) were true negative and 58 were positive base of chest CT scan results. The sensitivity of the rapid diagnostic test compared to chest CT scan was 100%, its specificity was 42%, its positive predictive value was 58.86% and its negative predictive value was 100%. Conclusion: Due to the high accuracy and rapid diagnostic of rapid diagnostic test (SARS-CoV-2), this test is a valid and reliable tool for rapid diagnosis of Covid-19 disease in emergency cases.