OADDL is a full service veterinary medical diagnostic laboratory located on the Oklahoma State University campus. OADDL is a unit of the OSU College of Veterinary Medicine and receives over 25,000 accessions and conducts more than 180,000 tests per year. Submissions to the laboratory come from all of Oklahoma's 77 counties and over 40 states. The operating expenses are covered by state appropriations and fees charged for services.