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 Response of Repeated Cycle of Ovulation Induction in Human in Vitro Fretilization and Gamete Intra-Fallopian Transfer Yong-Duk Shin, Jung-Gu Kim, Shin-Yong Moon, Jin-Yong Lee, Yoon-Seok Chang Department of Obstetrics and Gynecology, College of Medicine, Seoul National University 인간난자 체외수정 및 생식자 난관내이식술의 반복주기에서 과배란유도반응에 관한 연구 신용덕, 김정구, 문신용, 이진용, 장윤석 서울대학교 의과대학 산부인과학교실 Abstract In order to evaluate the consistency of the serum estradiol pattern and response and to determine the influence of number of ovary on them in repeat cycles in the same patient, 57 cycles in 24 patients who underwent in Vitro Fertilization-Embryo Transfer or Gamete Intrafallopian Transfer in Seoul National University Hospital. The patients were stimulated by follicular stimulating hormone and human menopausal gonadotropin and classified as high(${\geqq}$400 pg/ml) and low(<400 pg/ml) response group according to preovulatory estradiol concentration and classified as three estradiol patterns (A,G.B) according to Jones criteria. Seventeen(89.5%) of 19 patients in when a high response to ovulation induction in their first cycle showed a high response. 40%(2/5) of the second ovulation induction cycle were low response in the patient whose first cycle resulted resulted in a low response. Serum estradiol pattern in the first ovulation induction cycle tended to be repeated in the second cycle. Women with high response tended to be more likely to have A and G patterns and less likely to have a cancellation than those with low response. One-ovary patients were at higher risk for inadequate ovulation induction response.