Traditionally during ovum pick-up in ICSI, we aspirate the follicles for oocyte retrieval but unfortunately we don't make use of the follicular fluid (FF) and we discard it in spite of the fact that this does not happen in nature. The fallopian tube picks-up the FF with the oocyte during ovulation. As this fluid contains stem cell factor and C-Kit receptor responsible for implantation and IGF responsible for endometrial growth and TGF that improves implantation. That's why flushing the endometrial cavity with FF after ovum pick-up might improve endometrial receptivity and implantation rates; the limiting step in ICSI.