Early cleavage is a valuable addition to existing embryo selection parameters: a study using single embryo transfers

Human Reproduction
Aafke P A Van MontfoortJohannes L H Evers

Abstract

To reduce the twin pregnancy rate, elective single embryo transfer (eSET) is increasingly implemented. Improvement of the results obtained with eSET can be achieved by better selection of the most viable embryo. This study investigated the predictive value of early cleavage (EC) as an additional parameter for selecting the embryo with the highest implantation potential by using data from SET's. Data from 165 SET's were retrospectively evaluated. Cleavage to the 2-cell stage was determined 23-26 h after injection or 25-28 h after insemination. Selection of the embryo to be transferred was based on cell morphology and cell number on the day of transfer, not on the EC status. Additional information on the predictive value of EC on developmental potential was obtained by analysing 253 transfers with two embryos (double embryo transfer, DET) and blastocyst formation of 1160 surplus embryos. Logistic regression was used to determine the predictors of pregnancy or blastocyst development. A significantly higher pregnancy rate was observed after transfer of single EC embryos compared to single non-EC embryos (46 versus 18%). This result was confirmed by the significantly higher pregnancy rate after DET with two EC embryos as compared to...Continue Reading

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