alexa Culture and transfer of human blastocysts increases implantation rates and reduces the need for multiple embryo transfers.
Immunology

Immunology

Journal of Immunobiology

Author(s): Gardner DK, Vella P, Lane M, Wagley L, Schlenker T, , Gardner DK, Vella P, Lane M, Wagley L, Schlenker T, , Gardner DK, Vella P, Lane M, Wagley L, Schlenker T, , Gardner DK, Vella P, Lane M, Wagley L, Schlenker T,

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Abstract OBJECTIVE: To determine whether the transfer of blastocysts on day 5, developed in sequential culture media, resulted in an increase in implantation rate compared with embryos transferred on day 3. DESIGN: Comparative study of embryo culture regimes. SETTING: Private practice assisted reproductive technology center. PATIENT(S): Twenty-three patients undergoing routine IVF cycles. INTERVENTION(S): Culture of embryos to day 3 in either standard culture conditions or a serum-free chemically defined medium. One hundred one embryos were subsequently cultured from day 3 to day 5 in a second serum-free medium specifically designed to support development of the blastocyst. MAIN OUTCOME MEASURE(S): Embryo cell number and quality on day 3. Blastocyst development on day 5. Implantation rate (determined by fetal heart) and ongoing pregnancy rate (PR). RESULT(S): Implantation rates for embryos transferred at the blastocyst stage of development were twice that observed for embryos transferred on day 3, around the eight-cell stage. Significantly more embryos were required for transfer on day 3, compared with day 5, to establish similar PRs. CONCLUSION(S): Viable human blastocysts can be obtained in sequential culture media in the absence of coculture and serum. Transfer of blastocysts in IVF will facilitate high PRs while limiting the number of embryos transferred and therefore minimizes the risk of multiple gestation.
This article was published in Fertil Steril and referenced in Journal of Immunobiology

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