Anonymous oocyte donation performed exclusively with embryos cryopreserved at the pronuclear stage

Mark A. Damario, Diane G. Hammitt, Terri M. Galanits, Sherry A. Stevens, Donna R. Session, Daniel A. Dumesic

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Objective: To evaluate the clinical outcomes of patients who participated in an anonymous oocyte donation program that used embryos cryopreserved at the pronuclear stage. Design: Observational study. Setting: A tertiary care reproductive medicine unit. Patient(s): Anonymous oocyte donors and their respective recipients. Intervention(s): Oocyte donors underwent a standard controlled ovarian hyperstimulation protocol and transvaginal ultrasound-guided oocyte retrieval. Oocyte recipients underwent at least one programmed hormone replacement cycle with transcervical ET. Main Outcome Measure(s): Thaw survival, implantation, clinical and ongoing pregnancy rates. Result(s): Thirty-six oocyte retrievals resulted in one ET to date. The mean numbers of oocytes that were retrieved and normally fertilized were 18.2 and 11.6, respectively. Fifty-one embryo thaw-transfer cycles were performed, with an embryo thaw survival rate of 93.5%. The clinical and ongoing pregnancy rates per ET were 52.9% and 51%, respectively. The overall implantation rate was 28.7%. The percentage of oocyte retrievals that resulted in at least one ongoing pregnancy to date was 69.4%. Conclusion(s): Anonymous oocyte donation can be conducted efficiently with the exclusive use of embryos cryopreserved at the pronuclear stage. This approach facilitates synchronization of the donor-recipient pair, eliminates the risk that recipients will begin hormonal therapy without embryo availability, and produces an acceptable ongoing pregnancy rate per oocyte donation.

Original languageEnglish (US)
Pages (from-to)830-835
Number of pages6
JournalFertility and Sterility
Issue number5
StatePublished - May 1999

Bibliographical note

Copyright 2007 Elsevier B.V., All rights reserved.


  • Embryo cryopreservation
  • Implantation rate
  • Oocyte donation
  • Pregnancy rate
  • Pronuclear stage

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