Normal Range of Uterine Size
May 25, 2021
Source: Cainiu Health
Dr. Yi Ping
Introduction
Under normal circumstances, the sum of the uterus’s length, thickness, and width exceeds 12 cm; specifically, the uterine length ranges from 5.5 to 7.5 cm, the width from 4.5 to 5.5 cm, and the thickness from 3 to 4 cm. To assess uterine size, a gynecological examination can be performed during the non-menstrual period. Uterine hypoplasia may impair fertility.
During gynecological B-mode ultrasound examinations, the diagnostic report invariably lists the size of the uterus. The uterus is a predominantly muscular organ shaped like an inverted, slightly flattened pear. It lies centrally within the pelvic cavity of the lower abdomen, positioned between the bladder and the rectum. Anatomically, it consists of the uterine fundus, uterine body, uterine isthmus, and cervix. So, what constitutes the normal size range for the uterus?
Under normal circumstances, the sum of the uterus’s length, thickness, and width exceeds 12 cm. Specifically, its length measures 5.5–7.5 cm, its width 4.5–5.5 cm, and its thickness 3–4 cm. To assess uterine size, a gynecological examination can be performed outside the menstrual period.
Uterine hypoplasia (inadequate uterine development) may impair fertility. A small uterus reflects delayed uterine development—failure to reach normal adult dimensions—and thus inevitably affects female fertility to some degree; in severe cases, it may even lead to uterine infertility.
Uterine size varies across different stages of female development. Moreover, in adult women, the uterus may gradually enlarge with advancing age, only to shrink again after menopause. Slight deviations—either larger or smaller than the normal reference range—typically have no clinically significant impact on fertility. Additionally, ultrasound physicians routinely describe the ratio of the uterine body to the cervix: this ratio is 1:2 during infancy and 2:1 in adult women.
