Measurement of serum anti-Müllerian hormone concentration in female dogs and cats before and after ovariohysterectomy.

Anti-Müllerian hormone (AMH), or Müllerian inhibitory substance, is a hormone that is best known for its production by fetal testes in mammals and as the inhibitor of Müllerian (paramesonephric) duct development in males. However, following the development of the Müllerian ducts into the oviduct, uterus, and upper vagina in female mammals, the ovaries produce AMH, which can be found in measureable amounts within the peripheral circulation, especially in adults. The ovaries appear to be the sole source of AMH in the circulation; therefore, it may be a useful marker in clinically relevant situations when an assessment of the presence or absence of ovaries or ovarian remnants in dogs and cats is important. To that end, a commercially available, human-based assay was evaluated for the measurement of AMH in dogs and cats. A preliminary assessment involved a single test on a set of serum samples from dogs that were submitted to a diagnostic endocrinology laboratory for other tests. Favorable preliminary results led to a more formal assessment of the assay using serum samples from dogs and cats with the presence or absence of the ovaries known by surgical confirmation. Overall, a single measurement of serum AMH concentration was highly effective at distinguishing ovariohysterectomized from intact adult animals. In addition, the assay also accurately identified several cases of ovarian remnant syndrome.