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Zygote intrafallopian transfer (ZIFT) was used as a treatment for long-standing nontubal infertility for a 2-year period. The overall clinical pregnancy rate for 114 tubal transfers was 40.4% with a delivery/ongoing rate of 34.2%. Concurrent use of in vitro fertilization and embryo transfer (IVF-ET) for tubal factor infertility gave significantly lower clinical pregnancy and delivery/ongoing rates (21.1% and 15.8%, respectively). The use of gamete intrafallopian transfer (GIFT) for nontubal infertility yielded a 32% clinical pregnancy rate and a 26% delivery rate for 53 transfers. Zygote intrafallopian transfer resulted in an implantation rate per zygote of 17% overall compared with 8.1% per embryo for IVF-ET and 11.2% per oocyte for GIFT. The transfer of three zygotes per patient gave the same clinical pregnancy rate as the transfer of four while reducing the incidence of multiple gestation from 19% to 7.8% per transfer. No significant decline in the clinical pregnancy or delivery rate was seen with ZIFT in women aged 25 through 39.
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