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 About Marshfield Labs

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Marshfield Labs is one of the largest full-service private practice laboratory systems in the nation and a leader in laboratory medicine. 

As part of the Marshfield Clinic Health System, we benefit from the infrastructure, expertise and reputation of a large, multi-specialty group practice and premier research organization. Our pathologists, clinical scientists and laboratory personnel provide subspecialty expertise in all facets of laboratory medicine and pathology, and are available for consultation in support of our laboratory offerings.

Marshfield Labs' Reference Laboratory was established in 1973 to serve the needs of physicians and patients throughout Wisconsin, Upper Michigan, and Eastern Minnesota. Today, we have expanded to multiple lab locations throughout the Midwest offering Veterinary, Research and Toxicology testing to clients nationwide.

As we have grown we have also advanced. Across all of our labs we are constantly working to provide the most innovative technologies available as well as the expertise our clients have come to expect.  ​​


Marshfield Labs has multiple locations throughout the Midwest. We serve clients nation-wide through our convenient courier service.


Marshfield Labs location map 

1000 N Oak Ave.
Marshfield, WI 54449


1612 N. High Point Rd.
Middleton, WI 53562
2. Waukesha Vet Lab
360 Bluemound Rd.
Waukesha, WI 53188

3. Cleveland Vet Lab
15473 Neo Pkwy.
Cleveland, OH 44128

4. Minneapolis Vet Lab
5301 Excelsior Blvd
St Louis Park, MN 55416

Meet Our Staff

Director, Division of Laboratory Medicine

Thomas R. Fritsche, MD

Lab Administrative Director

Pam Carter

Director, Veterinary Lab

Frances M. Moore, DVM

Director, Toxicology

Joyce L. Flanagan, PhD


 Lab Milestones

First US installation of Cerner Labotix automation​​​​​​​​
  • Drs. Brazzell and Fritsche lead Research Testing Divisions

  • Embraces One Health​’s global strategy

  • We join NextGxDx​ to control genetic testing expense for patients​