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Preferable correlation to blastocyst development and pregnancy rates with a new embryo grading system specific for day 3 embryos.

Abstract：

PURPOSE:To investigate the cleavage stage embryo quality by the correlation between the morphological features and blastocyst development rate to develop a new embryo grading system. METHODS:A retrospective analysis, including 216 cycles of cleavage stage embryo transfer and 251 cycles of blastocyst transfer. The correlation with blastocyst development of the embryo cleavage stage, fragmentation and uniformity of blastomeres was evaluated. RESULTS:There were significant differences in the blastocyst development rate between > or =7 cells and < or=6 cells (68.8% vs. 30.7%), <50% fragmentation and > or =50% fragmentation (51.9% vs. 25.7%), and evenly sized blastomeres and unevenly sized blastomeres (48.7% vs. 30.1%) on day 3. The new grading system defined by these 3 parameters showed a preferable correlation to the pregnancy rate. CONCLUSIONS:The new grading system specific for day 3 embryos is useful for the selection of good quality embryos and may improve the pregnancy rate.

journal_name

J Assist Reprod Genet

journal_title

Journal of assisted reproduction and genetics

authors

Nomura M,Iwase A,Furui K,Kitagawa T,Matsui Y,Yoshikawa M,Kikkawa F

doi

10.1007/s10815-006-9086-5

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

23-8

issue

1

eissn

1058-0468

issn

1573-7330

journal_volume

24

pub_type

杂志文章

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