Clinical outcomes of elective single morula embryo transfer versus elective single blastocyst embryo transfer in IVF-ET

  • Sang Min Kang
  • Sang Won Lee
  • Hak Jun Jeong
  • San Hyun Yoon
  • Min Whan Koh
  • Jin Ho Lim
  • Seong Goo Lee



To compare the clinical outcomes of elective single morula embryo transfer (eSMET) versus elective single blastocyst embryo transfer (eSBET) in selected patients.


This study was a retrospective study which analyzed for 271 cycles in women under 37 years of age who are undergoing their first or second trial of in vitro fertilization-embryo transfer (IVF-ET) from January 2008 to December 2009. The eSMET was performed on day 4 (n = 130) and the eSBET was conducted on day 5 (n = 141).


The clinical pregnancy rate (51.5% vs. 51.8%, p = 0.97), implantation rate (52.3% vs. 52.5%, p = 0.98), and live birth rate (39.2% vs. 44.7%, p = 0.36) were similar in the eSMET and eSBET groups, respectively. The miscarriage rate of the eSMET group (23.9%) was slightly higher than that of the eSBET group (13.7%) (p = 0.12), without reaching statistical significance. There was only one case of monozygotic twin pregnancy in each group.


The clinical outcomes of day 4 eSMET were comparable to those of day 5 eSBET. Therefore, day 4 eSMET is a viable option or an alternative to day 5 eSBET, with no difference in success rates.


Elective single embryo transfer Morula Blastocyst Monozygotic twins Live birth 


Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Sang Min Kang
    • 1
  • Sang Won Lee
    • 1
  • Hak Jun Jeong
    • 1
  • San Hyun Yoon
    • 2
  • Min Whan Koh
    • 3
  • Jin Ho Lim
    • 2
  • Seong Goo Lee
    • 1
  1. 1.Maria Fertility ClinicDaeguRepublic of Korea
  2. 2.Seoul Maria Fertility HospitalSeoulRepublic of Korea
  3. 3.Department of Obstetrics and Gynecology, College of MedicineYeungnam UniversityDaeguRepublic of Korea

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