Since Dong-A ST foundation, the first E.I.A. Dong-A ST developed a diagnostic reagent for hepatitis B, AISDIA I / II, Dong-A HCV, Dong-A HBsAg, Dong-A Anti HBs, Dong-Syphilis etc. Continuously Dong-A ST have made efforts to localize diagnostic products, such as Thermo Fisher Scientific, BD etc. Through the introduction of diagnostic products, accurate early diagnosis of disease. Dong-A ST contribute to diagnosis.