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What are the fases of the endometrial cylce?

By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 10/20/2023

Since the endometrium develops as a function of the hormones that act throughout the menstrual cycle, estrogen and progesterone, it also has two different phases:

  • Proliferative endometrium: its thickness increases little by little thanks to the effect of estrogens.
  • Secretory endometrium: it matures and becomes receptive thanks to progesterone secreted by the corpus luteum.
Imagen: Endometrial status according to the phase of the menstrual cycle

An ultrasound can be used to measure the endometrial thickness and find out what stage it is in.

 Zaira Salvador
Zaira Salvador
B.Sc., M.Sc.
Embryologist
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)
License: 3185-CV
Embryologist. Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI) License: 3185-CV.