alexa Introduction of blastocyst culture and transfer for all patients in an in vitro fertilization program.
Genetics & Molecular Biology

Genetics & Molecular Biology

Human Genetics & Embryology

Author(s): Marek D, Langley M, Gardner DK, Confer N, Doody KM,

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Abstract OBJECTIVE: To evaluate the nonselective application of extended embryo culture on the outcome of IVF. DESIGN: Retrospective analysis. SETTING: Private practice assisted reproductive technology center. PATIENT(S): Seven hundred ninety nonselected patients undergoing IVF with controlled ovarian stimulation. INTERVENTION(S): For day 3 ET, multicell embryos were cultured in human tubal fluid medium and 12\% synthetic serum substitute. For day 5 ET, embryos were cultured for 48 hours in S1 medium and then for 48 hours in S2 medium. MAIN OUTCOME MEASURE(S): Implantation rate (determined by total no. of visualized gestational sacs), ongoing pregnancy rate, and number of embryos available for ET. RESULT(S): Respective day 3 and day 5 implantation rates for patients aged <35 years (29.5\% and 38.9\%), patients aged 35-39 years (20.7\% and 28.2\%), and all patients combined (23.3\% and 32.4\%) were statistically significantly different. Significantly more embryos were transferred on day 3 than on day 5 for patients aged <35 years (2.9 vs. 2.4), patients aged 35-39 years (3.1 vs. 2.6), and all patients combined (3.0 vs. 2.5). The difference in ongoing pregnancy rates per retrieval was statistically significant for day 3 compared with day 5 transfers for all patients combined (35.9\% vs. 43.8\%). Cancellation rates for transfer after retrieval increased significantly for day 3 compared with day 5 transfer (2.9\% vs 6.7\%). CONCLUSION(S): These results demonstrate the feasibility of using extended embryo culture in a nonselective manner for couples undergoing IVF. Overall, extended embryo culture was associated with a significant increase in pregnancy rates and implantation rates and a significant decrease in the number of embryos transferred. The rate of multiple implantation among patients aged <35 years warrants consideration of single blastocyst transfers for this group.
This article was published in Fertil Steril and referenced in Human Genetics & Embryology

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