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Related Concept Videos

In Vitro Fertilization01:24

In Vitro Fertilization

In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...
Meiosis II01:57

Meiosis II

Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each containing...

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Related Experiment Video

Updated: May 24, 2026

Inducing Pseudopregnancy in Female Mice Without the Need for Vasectomized Males Prior to Non-Surgical Embryo Transfer or Artificial Insemination
05:36

Inducing Pseudopregnancy in Female Mice Without the Need for Vasectomized Males Prior to Non-Surgical Embryo Transfer or Artificial Insemination

Published on: July 7, 2023

[Frozen embryo transfer protocol: does spontaneous cycle give good results?].

D El Bahja1, P Hertz, T Schweitzer

  • 1Centre d'assistance médicale à la procréation, hôpital maternité de Metz, 8, rue des Récollets, 57042 Metz cedex 1, France.

Gynecologie, Obstetrique & Fertilite
|February 21, 2012
PubMed
Summary

Frozen embryo transfers in spontaneous cycles resulted in higher pregnancy and delivery rates compared to substituted or stimulated cycles. This suggests natural cycles are optimal for normo-ovulating patients undergoing frozen embryo transfer.

Keywords:
AccouchementCycle spontanéDeliveryEmbryon congeléFrozen embryoGrossessePregnancySpontaneous cycleTransferTransfert

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Utero-tubal Embryo Transfer and Vasectomy in the Mouse Model
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Utero-tubal Embryo Transfer and Vasectomy in the Mouse Model

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Last Updated: May 24, 2026

Inducing Pseudopregnancy in Female Mice Without the Need for Vasectomized Males Prior to Non-Surgical Embryo Transfer or Artificial Insemination
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Utero-tubal Embryo Transfer and Vasectomy in the Mouse Model
09:33

Utero-tubal Embryo Transfer and Vasectomy in the Mouse Model

Published on: February 28, 2014

Area of Science:

  • Reproductive Endocrinology
  • In Vitro Fertilization
  • Embryo Transfer Protocols

Context:

  • Frozen embryo transfer (FET) is crucial for optimizing pregnancy rates per retrieval.
  • In France, stimulated cycles account for 60% of FET procedures.
  • Optimal endometrial preparation for FET remains debated.

Purpose:

  • To evaluate and compare the outcomes of frozen embryo transfers performed in spontaneous, substituted, and stimulated cycles.
  • To determine the most effective endometrial preparation method for FET.

Summary:

  • This retrospective study analyzed 333 patients undergoing FET, comparing spontaneous (n=132), substituted (n=24), and stimulated (n=177) cycles.
  • Pregnancy rates were significantly higher in spontaneous cycles (20.49%) versus substituted (13.04%) and stimulated (11.32%) cycles (P=0.0348).
  • Delivery rates also showed a similar trend, being significantly higher in spontaneous cycles (13.93%) compared to substituted (8.7%) and stimulated (6.29%) cycles (P=0.0314).

Impact:

  • Findings support the use of spontaneous cycles for FET in normo-ovulating patients.
  • Natural cycles offer a cost-effective and less burdensome alternative with comparable or superior success rates.
  • This research provides evidence to guide clinical decisions in assisted reproductive technology.