What is the normal range for endometrial thickness in children?
Nov 15, 2025
Source: Cainiu Health
Dr. Zhou Xiaofeng
Introduction
In prepubertal children (typically under 10 years of age), ovarian function has not yet matured, hormone levels in the body are low, and the endometrium remains non-proliferative, usually measuring about 1–3 mm in thickness. If the endometrial thickness falls within this range during this stage and there are no symptoms such as abnormal bleeding or abdominal pain, it is generally considered a normal physiological condition and does not require excessive concern.
In general, there is no uniform standard for endometrial thickness in children, as it varies with age. It is typically thin before puberty and approaches adult ranges after puberty. If concerned, it is recommended to seek medical advice early. Detailed analysis is as follows:
In prepubertal children (usually under 10 years old), ovarian function has not yet matured and hormone levels in the body are low. The endometrium remains in a non-proliferative state and is generally thin, typically around 1–3 mm. If endometrial thickness falls within this range during this stage and there are no symptoms such as abnormal bleeding or abdominal pain, it is usually considered a normal physiological condition, and excessive concern is unnecessary.
In pubertal children (typically aged 10–18 years), as ovarian function gradually develops and hormone levels begin to fluctuate, the endometrium undergoes cyclical proliferation and shedding. Thickness varies with the menstrual cycle—generally 3–5 mm outside the menstrual period, and may increase to 8–12 mm just before menstruation. If the thickness changes regularly with the cycle and no abnormal symptoms are present, this is also considered normal.
Interpretation of endometrial thickness measurements in children should take into account both age and clinical symptoms. If abnormal bleeding, abdominal pain, or significantly out-of-range thickness for the child's age group occurs, timely medical evaluation is necessary to determine the underlying cause and initiate appropriate management.
