What is the thickness of the endometrium in its three phases?
May 12, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
The thickness of the endometrium varies across its three phases: it is relatively thin during the proliferative phase, thicker during the secretory phase, and thins again during menstruation. During the proliferative phase, endometrial thickness typically ranges from 3 mm to 5 mm. In the secretory phase, it may increase to approximately 10 mm. During menstruation, the endometrial thickness decreases to between 2 mm and 4 mm.
Under normal circumstances, the thickness of the endometrium varies across its three phases: it is relatively thin during the proliferative phase, thicker during the secretory phase, and thins again during menstruation. The specific details are as follows:
1. Proliferative phase
The proliferative phase generally begins on day 5 to day 7 of the menstrual cycle and lasts until day 11 to day 14. During this phase, the endometrial lining gradually thickens, typically ranging from 3 mm to 5 mm. It is thinner in the early stage and becomes thicker toward the late stage.
2. Secretory phase
During the secretory phase, the endometrial thickness continues to increase. In the premenstrual period—specifically during luteal regression—the endometrium may reach approximately 10 mm in thickness.
3. Menstrual phase
Prior to menstruation, the endometrium reaches its maximum thickness, usually not exceeding 15 mm. However, menstruation involves the cyclical shedding and bleeding of the endometrial lining. Therefore, during the menstrual phase, the endometrium sheds and is expelled from the body, resulting in a thickness of about 2 mm to 4 mm.
Regardless of the phase, maintaining personal hygiene is essential. Underwear should be changed and washed daily to prevent gynecological disorders. Any abnormalities should be evaluated by a healthcare provider promptly.
