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The best anti-HCV S/Co values for reflecting HCV infection in a university hospital in the eastern part of TurkeyDabanlioǧlu, BülentYilmaz, AysunAkyüz, SümeyyeGülhan, Barişanti-HCVHCV RNAS/CoHepacivirusHepatitis CHepatitis C AntibodiesHospitalsHumansRetrospective StudiesRNA, ViralSensitivity and SpecificityTurkeyadultagedArticlechemiluminescent microparticle immunoassayfalse positive resultfemaleHepatitis C virushumanmajor clinical studymalepredictive valuereal time polymerase chain reactionreceiver operating characteristicretrospective studyuniversity hospitalviremiaarchitectdiagnosisIntroduction: The measurement of hepatitis C virus (HCV) RNA is a test that requires high cost, advanced technique, and qualified personnel. Diagnosis and treatment of patients may be delayed due to the high rate of false-positive results. This study aims to predict true antibody positivity and viremia by determining the most appropriate anti-HCV signal-to-cutoff (S/Co) value reflecting HCV infection. Methodology: The presence of anti-HCV antibodies and HCV RNA levels were examined in 72341 people who applied to the Mengücek Gazi Training and Research Hospital between January 2018 and December 2020. The anti-HCV levels were determined by using the Abbot Architect i2000 SR device (Abbot Diagnostics, Chicago, IL, USA). The levels of HCV RNA were determined in the COBAS AmpliPrep/COBAS, TaqMan 48 (Roche, Diagnostics, Pleasanton, USA) devices using serum samples from patients. Our study is a retrospective and methodological study. Results: Of the 150 patients with anti-HCV antibodies, 50 (33.3%) were HCV RNA positive, and 100 (66.7%) were HCV RNA negative. Anti-HCV levels of HCV RNA-positive patients were statistically higher than HCV RNA-negative patients. The most appropriate anti-HCV S/Co value for diagnosing hepatitis C patients was 15.4. The sensitivity of this value was 72%, specificity 88%, positive predictive value (PPV) 73.5%, and negative predictive value (NPV) 86.1%. Receiver operating characteristic (ROC) curve was significantly higher than 0.5 (95% confidence interval 0.938-0.827). Conclusions: Correct approaches can be applied in the diagnosis of HCV infection using the anti-HCV S/Co value found in our study. © 2024 Dabanlioǧlu et al.Journal of Infection in Developing Countries2024Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12007https://doi.org/10.3855/jidc.181052036-6590enJournal of Infection in Developing Countriesinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12007