Unraveling the Puzzle: Oocyte Maturation Abnormalities (OMAS)

Diagnostics (Basel). 2022 Oct 15;12(10):2501. doi: 10.3390/diagnostics12102501.


Oocyte maturation abnormalities (OMAS) are a poorly understood area of reproductive medicine. Much remains to be understood about how OMAS occur. However, current knowledge has provided some insight into the mechanistic and genetic origins of this syndrome. In this study, current classifications of OMAS syndromes are discussed and areas of inadequacy are highlighted. We explain why empty follicle syndrome, dysmorphic oocytes, some types of premature ovarian insufficiency and resistant ovary syndrome can cause OMAS. We discuss live births in different types of OMAS and when subjects can be offered treatment with autologous oocytes. As such, we present this review of the mechanism and understanding of OMAS to better lead the clinician in understanding this difficult-to-treat diagnosis.

Keywords: FSH; LH; empty follicle syndrome; fertility; meiosis; meiotic arrest; metaphase; oocyte maturation; oocyte maturation abnormalities; premature ovarian failure; resistant ovarian syndrome; stimulation.

Publication types

  • Review

Grants and funding

This research received no external funding.