What would a measurement of endometrial thickness less than 5mm in a postmenopausal woman not on hormone therapy indicate?

In a postmenopausal woman not on hormone therapy, a measurement of endometrial thickness less than 5mm is generally considered a normal finding. Typically, the endometrium thins significantly after menopause due to the decrease in estrogen levels. Endometrial thickness of less than 5mm suggests that there is no significant endometrial proliferation occurring, which is expected in a woman who has stopped menstruating and is not receiving hormone replacement therapy.

This finding can help rule out certain conditions, such as endometrial hyperplasia or malignancy, which would typically present with a thicker endometrium. Therefore, an endometrial thickness measurement under 5mm in this specific demographic is reassuring and indicates that further evaluation may not be necessary unless clinical symptoms warrant it.