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Oocytes collected from patients following ovarian stimulation exhibit varying qualities. The quality of oocytes has an effect on its subsequent fertilization, developmental competence postfertilization and the viability of resultant embryos. The aim of this article was to review the morphological criteria devised for assessment of oocyte quality by ordinary light and polarized light microscopy before IVF or ICSI. The parameters employed in the evaluation of oocyte morphology include the appearance of: structure of the cumulus–oocyte complex, oocyte cytoplasm, perivitelline space, zona pellucida, polar body and meiotic spindle. The authors have nothing to declare. J Reprod Stem Cell Biotechnol 2(1):1-13,2011 Correspondence: Dr Kristina Lasiene, Department of Histology and Embryology, Academy of Medicine, Lithuanian University of Health Sciences, A. Mickeviciaus str. 9, LT-44307 Kaunas, Lithuania. E-mail: krislasi@itc.kmu.lt T: +370 37 327201; F: +370 37 220733. #Sandra Glinskyte is a student.

Relevance and Methodology for the Morphological Analysis of Oocyte Quality in IVF and ICSI