| Embryo transfer is equally effective at cleavage stage and blastocyst stage: a randomized prospective study. | |
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MedLine Citation:
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PMID: 15541857 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: To compare the implantation and pregnancy rates after cleavage stage embryo transfer (ET) with transfer of blastocyst-stage (days 5-6) embryos. STUDY DESIGN: Prospective randomized trial at an assisted reproduction unit in a university hospital. Women with six or more follicles at the last ultrasound scan before oocyte aspiration were randomized for transfer of a maximum of two embryos after 2-3 days (n = 80) or after 5-6 days (n = 64) of culture. Embryo quality, implantation and pregnancy rates were evaluated. Statistical significance was tested with the Chi-square test and Fisher's exact test. RESULT(S): No significant difference was observed in implantation rates (21.1% versus 20.9%, respectively) and clinical pregnancy rates (36.7% versus 32.5% respectively) after blastocyst and cleavage stage transfers for the two groups. The pregnancy rate among subjects who had at least one good quality embryo transferred was 37.5% per day 2-3 ET and 60% per day 5-6 ET. CONCLUSION(S): The overall implantation and pregnancy rates after embryo transfer at cleavage stage and at blastocyst stage transfer were not statistically different. Women who had at least one good quality blastocyst (n = 25) had a high pregnancy rate (60% per ET). Blastocyst transfer is a good alternative for couples with many good quality embryos on day 2 after insemination. |
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Authors:
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Julius Hreinsson; Björn Rosenlund; Margareta Fridström; Ingvar Ek; Lev Levkov; Peter Sjöblom; Outi Hovatta |
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Publication Detail:
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Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial |
Journal Detail:
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Title: European journal of obstetrics, gynecology, and reproductive biology Volume: 117 ISSN: 0301-2115 ISO Abbreviation: Eur. J. Obstet. Gynecol. Reprod. Biol. Publication Date: 2004 Dec |
Date Detail:
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Created Date: 2004-11-15 Completed Date: 2005-04-08 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0375672 Medline TA: Eur J Obstet Gynecol Reprod Biol Country: Ireland |
Other Details:
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Languages: eng Pagination: 194-200 Citation Subset: IM |
Affiliation:
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Department of Obstetrics and Gynaecology, Karolinska Institutet, Karolinska University Hospital Huddinge, Fertility Unit K-59, Halsovagen, S-14186 Stockholm, Sweden. julius.hreinsson@kus.se |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Blastocyst* Cleavage Stage, Ovum* Embryo Implantation Embryo Transfer* Female Humans Pregnancy Pregnancy Rate Prospective Studies |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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