Irongate Equine December 30, 2020 Horse Ownership, Preventative Care Coggins Test: What, When, & Why Irongate Equine December 30, 2020 Horse Ownership, Preventative Care So what exactly IS a coggins test?The coggins test was named after Dr. Leroy Coggins, the veterinarian who helped develop the laboratory test for Equine Infectious Anemia, or EIA.