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Oocyte   Another name for an egg.   Oligo-ovulatory   A term describing a woman who ovulates infrequently.   Oligospermia   An abnormally low number of sperm in the ejaculate of the male.   Ongoing pregnancy   A clinical pregnancy which is continuing but undelivered at time of reporting.   Oocyte   The immature ovum, the unfertilized female gamete or sex cell (egg) produced in the ovaries each month, that contains the genetic information to be transmitted by the female.   Oocyte pick up   Recovery of eggs during IVF   Oocyte retrieval   A surgical procedure to collect the eggs contained within the ovarian follicles, either via laparoscopic or ultrasound-guided follicular aspiration through which a needle is inserted into the follicle, the fluid and egg are aspirated into the needle, and then placed into a culture medium-filled dish.   Oolemma   The plasma membrane of the oocyte.   Ovarian failure   The inability of the ovary to respond to any gonadotropic hormone stimulation, usually due to the absence of follicular tissue on a genetic basis or postmenopausal condition (absence of oocytes).   Ovarian reserve   The biologic "age" of an individual's oocytes; diminished ovarian reserve, which may be reflected by an elevated early follicular phase FSH and/or estradiol level, correlates with reduced chances for success following in vitro fertilization.   Ovarian stimulation   Inducing the ovary to mature more than one egg in a menstrual cycle   Ovaries   The sexual glands of the female which produce the hormones estrogen and progesterone, and in which the ova are developed.   Ovulation   The expulsion of a mature egg from its follicle in the outer layer of the ovary which usually occurs on approximately day 14 of a normal 28-day menstrual cycle.   Ovarian Hyperstimulation Syndrome (OHSS)   A rare but serious consequence of over-response to the drugs used to stimulate the ovaries.   Ovulation induction or controlled ovarian hyperstimulation (COH)   Pharmacologic stimulation of the ovaries, generally with gonadotropins and/or clomiphene citrate, with the objective of stimulating the development of multiple follicles and hence multiple eggs.   Ovary   One of a pair of female reproductive organs which produce eggs and hormones.   Ovarian Reserve   The ability of the woman to recruit a good number of ovarian follicles in response to the stimulating drugs used in fertility treatment.   Ovum   The unfertilized female gamete or sex cell (egg) produced in the ovaries each month, that contains the genetic information to be transmitted by the female.