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Human Reproduction, Vol. 6, No. 7, pp. 983-986, 1991
© 1991 European Society of Human Reproduction and Embryology

other

Sperm morphological assessment based on strict criteria and in-vitro fertilization outcome

T. Kobayashi1, M. Jinno, K. Sugimura, S. Nozawa, T. Sugiyama2 and E. Iida

Department of Obstetrics and Gynaecology, School of Medicine, Keio University 35 Shinanomachi, Shinjuku-ku, Tokyo 160, Japan 2Department of Obstetrics and Gynaecology, Ogikubo Hospital Tokyo, Japan

Correspondence: 1To whom correspondence should be addressed

One-hundred-and-twenty-three in-vitro fertilization (IVF) cycles were analysed in order to clarify the influence of strictly normal morphology (SNM) of spermatozoa on IVF outcome. SNM was defined using strict criteria according to Kruger with our modifications. The IVF cycles studied were divided into three groups: %SNM <12% (13 cycles), 12 <40% (68 cycles), ≥40% (42 cycles). The cleavage rates per oocyte were higher in the groups with 12–40% and ≥40% of %SNM than in the group with %SNM <12%. The embryo transfer rate per cycle increased with increasing %SNM. The overall pregnancy rate per cycle increased with increasing %SNM (7.7% in %SNM < 12%, 22.1% in 12–40% of %SNM, and 40.5% in %SNM ≥40%). The ongoing pregnancy rate per cycle also increased with increasing %SNM (7.7% in %SNM <12%, 14.7% in 12–40% of %SNM, and 31.0% in %SNM ≥40%). The miscarriage rate was lower in %SNM ≥40% (23.5%) than in 12–40% of %SNM (33.3%). It was suggested that %SNM is a good predictor of IVF outcome.

Key words: sperm morphology/fertilization in vitro/human/pregnancy/miscarriage


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