ESA Laboratories -- A Dionex Company We are an Industrial Hygiene/Clinical Reference laboratory with a reputation for quality and accuracy that is unparalleled, built on more than 30 years of superior service to customers. We are a leader in the field of laboratory services for Active Pharmaceutical Ingredient (API) and surrogate monitoring (with the lowest reporting limit of lactose in the industry), as well as method and applications development for customers who want to outsource aspects of a project or utilize an additional resources to create validated methods.