The Diagnostic Endocrinology Service provides adrenal, thyroid, and reproductive hormone testing for dogs and cats, as well as for several other species. We receive samples from veterinary clinics, laboratories, and universities in all 50 states within the U.S., and from more than 15 foreign countries. This Service has gained a national and international reputation for providing adrenal steroid profile testing in dogs, cats, ferrets, and rabbits that are suspected of having adrenal disease. These profiles provide a more complete evaluation of adrenocortical function by assessing hormone concentrations that arise from different parts of the hormone synthesis pathway. We are the only veterinary diagnostic endocrinology laboratory in the United States to offer an adrenal steroid profile test in dogs, cats and rabbits, and the first to offer this test in ferrets. Along with diagnostics in domestic species, we collaborate with veterinarians at zoos and aquariums to provide hormone analyses for various exotic species.