Eiken Chemical (栄研化学株式会社, Eiken Kagaku Kabushiki-gaisha) is a Japanese company headquartered in Tokyo, established in 1939. The company's business is manufacturing and sales of clinical diagnostics and equipment. Eiken's major products include fecal immunochemical test reagents, immunological and serological reagents, microbiological reagents, urinalysis test strips, clinical chemistry reagents, molecular genetics, medical devices and industrial products.