PBL Assay Science Logo

For almost 30 years PBL Assay Science have worked hand in hand with industry, academic, and government researchers to help solve difficult assay development and protein quantification problems. Known as a trusted source for high quality, high sensitivity ELISAs as well as interferon proteins and antibodies, PBL has expanded their assay services capabilities, including ultrasensitive cytokine detection services, and increased their human cell-expressed cytokine and growth factor offerings.

Whether you would like to customize a multiplex assay incorporating your key analytes, to serve as an outside laboratory to run samples in confirmatory assays or to express and purify a novel human cell-expressed protein, PBL is here to serve your needs.

Their beginnings are as a major provider of products, services, information, and know-how related primarily to interferons. The pioneering interferon research conducted by their founder, Sidney Pestka, M.D., and his many colleagues and collaborators reflects decades of exploration into interferon’s applications in medicine. Over the last two decades, PBL Assay Science has grown from start-up to well-respected company, employing state-of-the-art technology in conducting assay services and manufacturing world-class products for scientists around the globe. As their research, their products, and their services have moved beyond interferon into other cytokines and biological materials, they have grown into an Assay Science company with a broad knowledge base.

pbl assay kits

Assay Kits

Leading portfolio of ELISAs and multiplex kits for immunological assay development.




Interferons, Cytokines & Growth Factors for life science research.


pbl antibodies


Monoclonal and Polyclonal Antibodies validated for use in biological assays.