AMH and polycystic ovary syndrome: Although serum AMH levels in adolescents and adult women with both polycystic ovarian morphology and PCOS are significantly higher than in those without these features in all the studies included [58, 65–70], there was significant overlap in levels as well as heterogeneity between studies with regards to assays, life stage and phenotypes of the populations studied, including the use of different PCOS criteria.