Ultrasound evidence for variability in the size and development of normal human embryos before the tenth post-insemination week after assisted reproductive technologies.

@article{Dickey1993UltrasoundEF,
  title={Ultrasound evidence for variability in the size and development of normal human embryos before the tenth post-insemination week after assisted reproductive technologies.},
  author={Richard Palmer Dickey and Raymond F. Gasser},
  journal={Human reproduction},
  year={1993},
  volume={8 2},
  pages={331-7}
}
Differences in human chorionic gonadotrophin (HCG), average chorionic sac diameter, embryo/fetus crown-rump length and biparietal diameter were determined in 107 singleton pregnancies delivered after 34 weeks, whose post-insemination age was precisely known as a result of in-vitro fertilization (n = 28) or gamete intra-Fallopian transfer (n = 79). Crown-rump lengths were interpreted in relation to the developmental stage of the embryo. A 7-fold to 10-fold difference in HCG levels was observed… CONTINUE READING

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