IMR Press / CEOG / Volume 36 / Issue 4 / pii/1630635889636-91695241

Clinical and Experimental Obstetrics & Gynecology (CEOG) is published by IMR Press from Volume 46 Issue 1 (2019). Previous articles were published by another publisher on a subscription basis, and they are hosted by IMR Press on as a courtesy and upon agreement with S.O.G.

Open Access Original Research
The effect of blastomere number on embryo survival upon freezing/thawing
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1 The University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School at Camden, Cooper Hospital/University Medical Center, Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology & Infertility, Camden, NJ (USA)
Clin. Exp. Obstet. Gynecol. 2009, 36(4), 209–209;
Published: 10 December 2009

Purpose: To determine if the blastomere number of embryos at the time of freezing is related to its quality post-thaw. Methods: A retrospective cohort analysis of frozen/thawed embryos. Only multi-cell embryos were used for this study. If an embryo was of good quality it would either be transferred or re-frozen. Results: There did not appear to be any trend for a lower percentage of good quality embryos with fewer numbers of blastomeres. Conclusions: Though 4-cell embryos have a markedly lower implantation potential upon fresh embryo transfer compared to 6-8-cell embryos, this is not reflected in their ability to survive freeze-thawing.
Survival rate
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