title: [Parameters of ovulation in spontaneous ovulatory cycles].
abstract: The parameters of ovulation used at the infertility clinic of Tygerberg Hospital were evaluated in 45 spontaneously ovulating women. The mean maximum preovulatory serum oestradiol level was 1 274 pmol/l with a standard deviation of 432 pmol/l and an average daily increase of 245 pmol/l over the last 3 preovulatory days. Normal values were identified for a cervical mucus scoring system similar to the Insler system. The mean midluteal serum progesterone value was 25,5 nmol/l with a standard deviation of 7,5 nmol/l. Ultrasound examinations of the ovaries to diagnose ovulation were used for the first time in Tygerberg Hospital; the average of maximum diameters in three dimensions was used to measure follicles. The average daily pre-ovulatory growth rate was 2,3 mm and the maximum follicle size 20,5 mm with a standard deviation of 2,3 mm. The most common ultrasonic signs of ovulation were reduction in follicle size, development of irregular borders and intrafollicular echoes. In 5 patients endometrial histological dating lagged more than 2 days behind ultrasonic signs of ovulation. These were considered cases of luteal phase insufficiency. The maximum pre-ovulatory serum oestradiol levels were statistically significantly lower in these cases.
mesh_terms: D001831:Body Temperature; D002369:Castration; D002582:Cervix Mucus / Q000032:analysis; D004958:Estradiol / Q000097:blood; D005260:Female; D005498:Follicular Phase; D006801:Humans; D008183:Luteal Phase; D010060:Ovulation; D011374:Progesterone / Q000097:blood; D011446:Prospective Studies; D014463:Ultrasonography
chemical_list: D011374:Progesterone; D004958:Estradiol
vernacular_title: Parameters van ovulasie in spontane ovariale siklusse.