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Randomized Controlled Trial
. 2007 Jul;88(1):244-6.
doi: 10.1016/j.fertnstert.2006.11.070. Epub 2007 Feb 8.

Prospective evaluation of the optimal time for selecting a single embryo for transfer: day 3 versus day 5

Nicolas H Zech  1 , Bernard Lejeune, Francoise Puissant, Sabine Vanderzwalmen, Herbert Zech, Pierre Vanderzwalmen
Affiliations
Free article
Randomized Controlled Trial

Prospective evaluation of the optimal time for selecting a single embryo for transfer: day 3 versus day 5

Nicolas H Zech et al. Fertil Steril. 2007 Jul.
Free article

Abstract

To determine the best day for the selection and transfer of a single embryo, a prospective, randomized study was undertaken that compared the ongoing pregnancy rate (PR) after single embryo transfer (SET) on day 3 with that after single blastocyst transfer (SBT) on day 5. Our results show an overall significantly higher PR after SBT (32.8%) compared with SET (23.2%), and a PR of 40.8% after SBT versus 25.6% after excellent-quality embryos became available.

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