A formula for scoring human embryo growth rates in in vitro fertilization: Its value in predicting pregnancy and in comparison with visual estimates of embryo quality

@article{Cummins1986AFF,
  title={A formula for scoring human embryo growth rates in in vitro fertilization: Its value in predicting pregnancy and in comparison with visual estimates of embryo quality},
  author={James M. Cummins and T. M. Breen and Keith L. Harrison and Jillian M Shaw and Lynn M. Wilson and John F. Hennessey},
  journal={Journal of in Vitro Fertilization and Embryo Transfer},
  year={1986},
  volume={3},
  pages={284-295}
}
Two systems for measuring embryo development in vitro were evaluated. One was a 1–4 scale based on a subjective evaluation of embryo quality (EQ) from microscopic appearance. In addition, a formula for scoring embryo growth rate in vitro was developed. The embryo development rating (EDR) was based on the ratio between the time at which embryos were observed at a particular stage after insemination and the time at which they would be expected to reach that stage in a hypothetical “ideal” growth… CONTINUE READING

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The embryo development rating ( EDR ) was based on the ratio between the time at which embryos were observed at a particular stage after insemination and the time at which they would be expected to reach that stage in a hypothetical “ ideal ” growth rate with a cell cycle length of 11.9 hr .
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