Womb & liningDraft: awaiting clinical review

Endometrial thickness

The thickness of the womb lining on ultrasound, which changes throughout the cycle.

Overview

The endometrium (womb lining) thickens in the first half of the cycle and changes texture after ovulation. Its thickness is measured on a transvaginal ultrasound.

What counts as normal depends on the cycle day and the clinical context.

What is well established

In IVF, a very thin lining is associated with lower pregnancy rates, though pregnancies do occur with thinner linings.
Measurements should be interpreted with the cycle day and any medication being taken.

Uncertain or emerging evidence

Treatments proposed to thicken a thin lining have limited and inconsistent evidence.

This guide is general information and does not replace advice about your own circumstances. Clinical review pending.