Tosoh The Chemistry of Innovation


Tosoh Bioscience, Inc., based in South San Francisco, CA is a U.S. subsidiary of Tosoh Corporation’s Bioscience Division, headquartered in Tokyo, Japan.  Established in the United States in 1989, Tosoh Bioscience has become renown through the Americas for providing sophisticated diagnostic systems to doctor’s offices, hospitals and reference laboratories.

Diagnostic Leadership:

Tosoh builds upon its proven reputation and maintains leadership in Clinical Diagnostics. With state-of-the-art immunoassay and HPLC systems, Tosoh offers superior instrumentation to continually meet the operational and economic needs of laboratories today and in the future.

Immunoassay Pioneers:

Tosoh, a pioneer in the field of automated immunoassay systems, continually evolves its product line to offer the most advanced systems in the world. Tosoh AIA Automated Immunoassay Analyzers provide testing for a broad menu of quality assays in a unique patented dry reagent format.


With rapid changes in technology, laboratories demand innovation. Tosoh remains at the forefront with a world class network of research facilities, scientists, engineers and customer support specialists. Tosoh has a solid commitment to provide customers the best in clinical diagnostics




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