The cause of oocyte morphological abnormalities is probably multifactorial, so larger studies are in need to investigate the relationship between the probable effects of retrieved immature oocytes on feature of mature cohort oocytes. Rates of fertilization, formation of good quality embryo, early cleaved embryo, pregnancy and immature rates vs mature rates according to the number of GV oocytes. There was no significant difference for maternal age between two groups. The findings also showed that the rate of wide PVS is higher in group A, as well as in older women. Factors of immature rates vs mature rates for the establishment of a successful program of spank mom 2000 sperm injection treatment for male infertility. Int J Fertil Steril. Also, the effect of maternal age on the quantity of immature oocyte was assessed. This article has been cited by other articles in PMC. COH has a key role in ART, and high doses of gonadotropins induce simultaneous growth and development of follicles. Fertility and Sterility 95 7: