What do the three values representing uterine size stand for?

The three measurements of uterine size represent the longitudinal diameter, anteroposterior diameter, and transverse diameter, respectively. The distance from the internal cervical os to the external os is defined as cervical length. The anteroposterior diameter is measured as the maximum dimension perpendicular to the longitudinal diameter on the same plane used for measuring the longitudinal diameter. The transverse diameter is obtained on a transverse cross-sectional view at the level of the uterine fundus.

The uterus is a vital female reproductive organ, shaped like an inverted pear slightly flattened from front to back. It is located centrally in the pelvic cavity of the lower abdomen, between the bladder and rectum, and consists of the fundus, body, isthmus, and cervix.

In women of reproductive age, the uterus is typically about 7–8 cm long, 4–5 cm wide, and 2–3 cm thick. If the uterus falls within this normal range, its size is considered normal. Slight variations—either larger or smaller—are generally not concerning. Women who have given birth, especially multiple times, may have a slightly enlarged uterus. A smaller-than-normal uterus may suggest infantile uterus, which is a form of uterine hypoplasia; severe cases could potentially affect fertility. Additionally, uterine size correlates somewhat with overall body size—for example, women with larger body frames tend to have larger uteri compared to those with smaller builds.

To determine whether the uterus is normal, a medical evaluation including ultrasound examination at a hospital is necessary.