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Updated: Jul 24, 2026
Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats
Published on: August 5, 2011
Pregnancy rates after embryo transfer depend on the provider at embryo transfer
R M Hearns-Stokes1, B T Miller, L Scott
1Walter Reed Army Medical Center and National Institute of Child Health and Human Development, National Institutes of Health, Washington, DC, USA.
Objective:
To evaluate the effect of individual providers on pregnancy outcome after embryo transfer.
Design:
Retrospective data analysis.
Setting:
University-based tertiary-care assisted reproductive technology program with 10 physician-providers.
Patient(S):
Six hundred and seventeen women who underwent 854 fresh embryo transfers between January 1996 and January 1999.
Intervention(S):
Pregnancies after embryo transfer were recorded for each provider.
Main Outcome Measure(S):
Establishment of a clinical pregnancy.
Result(S):
Three hundred ninety-three clinical pregnancies resulted from 854 embryo transfers, for an overall clinical pregnancy rate of 46.0% per embryo transfer. Three hundred forty-seven (40.6%) pregnancies were ongoing. The clinical pregnancy rate varied significantly between providers: for example, 17.0% (47 transfers) vs. 54.3% (57 transfers) (P<.05). Similarly, the ratio of high-grade embryos required to produce a gestational sac differed between providers. The number or quality of embryos transferred did not differ significantly.
Conclusion(S):
Significant differences were observed in pregnancy rates after embryo transfer done by different providers, suggesting that embryo transfer technique may influence pregnancy outcome in assisted reproductive technology.
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