An endometrial thickness of <12 mm does not exclude malignancy or pre‐malignancy in cases of abnormal uterine bleeding: An observational study

If sampling thresholds would change to not perform biopsies in those with an ET of less than 12 mm, eight cases of treatable disease would be missed in pre-menopausal people. This represents 13.6% of all endometrial cancers diagnosed in pre-menopausal people in the same time period. There is no ET cut-off to reliably exclude high-risk pathology and endometrial sampling should be performed in all cases of AUB with risk factors.