Endometrial thickness refers to the measurement of the lining of the uterus (endometrium). It is an important factor in the evaluation of the uterus, particularly in the context of menstrual disorders, fertility, and postmenopausal bleeding. The thickness of the endometrium can vary throughout the menstrual cycle and is influenced by hormonal changes. Abnormal thickness may indicate underlying health issues and often requires further evaluation.

Ultrasound is the easiest and most common method to take measurements. When ultrasound is not suitable due to the position of the uterus etc., doctors may use MRI to determine the endometrial thickness.