What is the normal range of endometrial thickness?
May 08, 2025
Source: Cainiu Health
Dr. Zhang Lu
Introduction
Under normal circumstances, the thickness of the endometrium in women typically ranges from 2 to 15 mm. However, the normal value may vary depending on the stage of the physiological cycle the woman is in. If abnormal endometrial thickness, such as excessive thickening or thinning, is detected, it is recommended to seek medical attention promptly, so that a doctor can provide a diagnosis and treatment recommendations based on the specific situation.
Under normal circumstances, the thickness of a woman's endometrium typically ranges from 2 to 15 mm. However, due to differences in the physiological cycle, the normal thickness of the endometrium may vary. A detailed analysis is as follows:
1. Follicular Phase
The follicular phase refers to days 5-14 of the menstrual cycle, during which the endometrium is generally 2-6 mm thick. At this time, the endometrium is in the proliferative phase, the follicles gradually develop, estrogen levels rise gradually, and the endometrium thickens under the influence of estrogen.
2. Ovulation Phase
The ovulation phase refers to days 15-28 of the menstrual cycle, during which the endometrium is generally 7-10 mm thick. At this stage, the follicles have matured and released an egg. Estrogen levels peak, further thickening the endometrium in preparation for implantation of the fertilized egg.
3. Luteal Phase
The luteal phase refers to day 29 of the menstrual cycle until the onset of the next menstruation, during which the endometrium is generally 10-15 mm thick. After ovulation, the ovaries enter the luteal phase and secrete progesterone and estrogen. Under the influence of progesterone, the endometrium continues to thicken, becoming softer and more nutrient-rich, which is conducive to the implantation and development of the fertilized egg.
4. Menstrual Phase
Menstruation is the result of periodic shedding of the endometrium. During the menstrual phase, the endometrium becomes thinner, usually less than 5 mm. This is because when menstruation begins, estrogen and progesterone levels in the body drop sharply, leading to the shedding and excretion of the endometrium.
5. Menopausal Phase
Menopause is the period during which ovarian function in women gradually declines. During menopause, due to declining ovarian function and reduced estrogen levels, the thickness of the endometrium also decreases accordingly, usually less than 5 mm.
If abnormal endometrial thickness, such as excessive thickening or thinning, is detected, it is recommended to seek medical attention promptly so that doctors can provide a diagnosis and treatment recommendations based on specific circumstances.
