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Comparative Study
Journal Article
A comparison of day 5 and day 6 blastocyst transfers.
Fertility and Sterility 2001 June
OBJECTIVE: To compare implantation and pregnancy rates according to the day of embryo transfer (day 5 or 6 after oocyte retrieval) when transfer was postponed until expanded blastocysts developed.
DESIGN: Retrospective clinical study.
SETTING: Private ART center.
PATIENT(S): One-hundred and eighty-three women undergoing blastocyst-stage embryo transfer following in vitro fertilization.
INTERVENTION(S): Bipronucleate oocytes were grown for up to 144 hours and subsequently transferred only when at least one embryo attained the expanded blastocyst stage.
MAIN OUTCOME MEASURE(S): Implantation and pregnancy rates.
RESULT(S): Blastocysts transferred on day 5 implanted at nearly twice the rate of blastocysts transferred on day 6 (36.3% vs. 19.0%). Pregnancy rates were also almost twice as high among the day 5 transfer patients (59.3% vs. 32.3%). In addition, more blastocysts developed (3.6 vs. 2.4), and more were transferred (2.7 vs. 2.3) to the day 5 transfer patients, although the proportion of expanded blastocysts among the blastocysts that were transferred was the same for the two groups (91.7% vs. 93.6%).
CONCLUSION(S): Embryos that develop to the expanded blastocyst stage and are transferred on day 5 after retrieval are approximately twice as likely to implant compared to those for which expansion and transfer are delayed until day 6.
DESIGN: Retrospective clinical study.
SETTING: Private ART center.
PATIENT(S): One-hundred and eighty-three women undergoing blastocyst-stage embryo transfer following in vitro fertilization.
INTERVENTION(S): Bipronucleate oocytes were grown for up to 144 hours and subsequently transferred only when at least one embryo attained the expanded blastocyst stage.
MAIN OUTCOME MEASURE(S): Implantation and pregnancy rates.
RESULT(S): Blastocysts transferred on day 5 implanted at nearly twice the rate of blastocysts transferred on day 6 (36.3% vs. 19.0%). Pregnancy rates were also almost twice as high among the day 5 transfer patients (59.3% vs. 32.3%). In addition, more blastocysts developed (3.6 vs. 2.4), and more were transferred (2.7 vs. 2.3) to the day 5 transfer patients, although the proportion of expanded blastocysts among the blastocysts that were transferred was the same for the two groups (91.7% vs. 93.6%).
CONCLUSION(S): Embryos that develop to the expanded blastocyst stage and are transferred on day 5 after retrieval are approximately twice as likely to implant compared to those for which expansion and transfer are delayed until day 6.
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