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Updated: Mar 30, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
Published on: October 24, 2025
The correlation of cumulus mucification patterns with oocyte maturation rate in vitro in FSH + LH-primed IVM cycles:
Isarin Thanaboonyawat1, Orawan Makemaharn2, Somsin Petyim2
1Infertility and Reproductive Biology Unit, Department of Obstetrics and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol University, 2 Wanglang Road, Bangkoknoi, Bangkok, 10700, Thailand. isarin.tha@mahidol.ac.th.
Purpose:
This prospective study was conducted to compare the oocyte maturation rate in vitro among four types of cumulus cell (CC) morphology, in dual gonadotropin-primed in vitro maturation (IVM) oocyte cycles.
Methods:
Two-hundred and thirty cumulus-oocyte complexes (COCs) were retrieved from FSH + hCG-primed in vitro maturation cycles of 20 patients diagnosed with polycystic ovarian syndrome. The COCs that contained immature oocytes were classified into four groups according to their cumulus mucification patterns (dispersed, clumped, compacted or sparse) and their oocyte maturation rates were compared. Chi square test and Fisher's exact test were used as appropriate.
Results:
Oocytes enclosed by dispersed and clumped CCs exhibited higher maturation rates than those with compacted and sparse patterns (P < 0.001).
Conclusion:
In dual gonadotropin-primed IVM cycles, oocyte maturation rates are highest in those showing dispersed and clumped CC patterns.
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