Journal of Assisted Reproduction and Genetics

, Volume 20, Issue 8, pp 323–326 | Cite as

Comparison of the Sex Ratio with Blastocyst Transfer and Cleavage Stage Transfer

  • Amin A. Milki
  • Sunny H. Jun
  • Mary D. Hinckley
  • Lynn W. Westphal
  • Linda C. Giudice
  • Barry Behr


Purpose: To evaluate the sex ratio in births conceived with blastocyst transfer compared to day 3-ET.

Methods: A retrospective analysis of IVF patients who became pregnant after blastocyst or cleavage stage transfer at Stanford University Hospital and a literature review were performed.

Result(s): In the day 3-ET group, the male-to-female (M/F) ratio was 157/139 (53%/47%) compared to 97/66 (59.5%/40.5%) in the blastocyst group (P = 0.18). Similar trends have been found in individual studies in the literature but reached statistical significance in only one out of six reports reviewed. The combined data from our study and the literature show a male-to-female ratio of 797/594 (57.3%/42.7%) in blastocyst transfer compared to 977/932 (51.2%/48.8%) in day 3-ET (P = 0.001).

Conclusion(s): Although individual studies may lack power to show an altered sex ratio with blastocyst transfer, the combined data presented in this report do suggest that the M/F ratio is higher with blastocyst transfer compared to cleavage stage transfer.

Blastocyst transfer cleavage stage transfer IVF sex ratio 


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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Amin A. Milki
    • 1
  • Sunny H. Jun
    • 1
  • Mary D. Hinckley
    • 1
  • Lynn W. Westphal
    • 1
  • Linda C. Giudice
  • Barry Behr
    • 1
  1. 1.Department of Gynecology and ObstetricsStanford University School of MedicineStanford

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