After each menstruation, the endometrium begins to regenerate again under the action of estrogens. At the beginning of the menstrual cycle, the endometrium is thin and not receptive and gradually increases in thickness. Towards the middle of the menstrual cycle, the endometrium is already thicker, between 8-12mm, and begins its receptive phase. If there is a viable embryo in the uterine cavity, it can implant in the endometrium and give rise to gestation. If pregnancy does not occur, the endometrium will detach again in the form of menstruation and a new menstrual cycle will begin.
Stages in endometrium and uterine receptivity
By Dr. José Luis Gómez Palomares (gynecologist), Laura Garrido BSc, MSc (embryologist), Óscar Oviedo Moreno MD (gynecologist), Dr. Paloma de la Fuente Vaquero MD, PhD, MSc (gynecologist), Zaira Salvador BSc, MSc (embryologist) and Romina Packan (invitra staff).
Last Update: 12/17/2019