Tox Path Specialists, LLC


Tox Path Specialists is a fully GLP-compliant laboratory specializing in neurohistology and neuropathology evaluations and consultations in addition to being a full-service histopathology provider. We provide a wide range of services, including specialized nerve processing, immunohistochemical procedures, stereology/morphometry, and more.


Tox Path Specialists is led by Dr. Mark T. Butt (DVM, DACVP) an internationally recognized expert in the field of neuropathology. Along with Dr. Sarah Cramer, also a  board-certified pathologist and their team of research associates, TPS is equipped to manage every step of your project. In addition, the company is supported by a full laboratory managed by Dave Hodge, HT (ASCP) who has over 25 years of experience in histology and laboratory management. Our team of experts will work to design a study that fits your needs and manage all coordination with our laboratory on a larger histopathology effort.


Located in Frederick, MD, Tox Path Specialists maintains a 4,500 square foot facility designed to efficiently complete your projects. Our offices and laboratory feature heat and smoke detectors, a fire suppression sprinkler system, and a natural gas powered back-up generator to ensure the safe storage of all of your study materials.

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