What hormone is responsible for preparing the endometrium during the proliferative phase? When is it administered?

By Rebeca Reus BSc, MSc.
Last Update: 10/10/2018

The hormones that promote endometrial growth during the first phase of the cycle (proliferative) are estrogens. They are administered in most of the treatments that involve an embryo transfer in an additional cycle, aside from the ovarian stimulation one. In short, estrogen is administered in the following cases:

  • IVF-ICSI treatments with donor eggs, with both fresh and frozen eggs/embryos
  • Frozen embryo transfers (using embryos that were frozen in previous cycles)
  • Embryo donation

Suggested for you: Endometrial Preparation for Implantation After IVF Embryo Transfer.

BSc, MSc
Embryologist
Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).
Embryologist. Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).
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