{"paper_id":"0b42274b-3c5e-4821-a83f-5a4c19064bfa","body_text":"Purpose\nOur purpose was to evaluate the possible effects of the number of embryos transferred, the depth of embryos placed within the tube(s), and unilateral or bilateral tubal transfer on pregnancy initiation in tubal embryo transfer (TET).\nMethods\nOne hundred eight consecutive TET cycles were analyzed. Oocyte retrievals were carried out by transvaginal ultrasound-guided aspiration of follicles. Forty-eight hours after oocyte retrieval, the developing embryos at the stage of two to four cells were transferred into the fallopian tube(s) by laparoscopy. A maximum of four embryos was transferred to each patient.\nResults\nThe pregnancy rates were similar among the cycles in which two, three, or four embryos were transferred. In addition, there was no significant difference in the pregnancy rate whether the embryos were deposited >4 cm or between 3 and 4 cm into the tube(s). Although the pregnancy rate was greater in cycles of bilateral tubal transfer, the difference from that of unilateral transfers was not significant.\nConclusion\nOur data indicate that when two to four embryos were transferred and the embryos were placed ⩾3 cm within the tube(s), unilateral or bilateral tubal transfer had little influence on the ultimate success of TET.\nSimilar content being viewed by others\nReferences\nEdwards RG, Steptoe PC: Current status of in vitro fertilization and implantation of human embryos. Lancet 1983;2:1265\nYee B, Rosen GF, Chacon RR, Soubra S, Stone SC: Gamete intrafallopian transfer: The effect of the number of eggs used and the depth of gamete placement on pregnancy initiation. Fertil Steril 1989;52:639–644\nHaines CJ, O'Shea RT: Unilateral gamete intrafallopian transfer: The preferred method? 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J Assist Reprod Genet 9, 534–538 (1992). https://doi.org/10.1007/BF01204250\nReceived:\nAccepted:\nIssue date:\nDOI: https://doi.org/10.1007/BF01204250","source_license":"CC0","license_restricted":false}