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Pregnancy outcome after blastocyst transfer as compared to early cleavage stage embryo transfer
Department of Gynecological Endocrinology & Reproductive Medicine, University Clinics Bonn, Sigmund-Freud-Strasse 25, D-53105 Bonn, Germany
1 To whom correspondence should be adressed. Email: m.Montag@uni-bonn.de
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Sir,
We have read with great interest the retrospective cohort study on the possible benefit of blastocyst transfer (BS group) compared to cleavage stage transfer (CS group) on day 23 by Schwärzler et al. (2004)
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Based on their data, the authors conclude that blastocyst transfer may lead to a higher pregnancy rate with an overall better