Indications for Endometrial Biopsy in Premenopausal Patients

Primary Indications for EMB in Premenopausal Women

The American College of Obstetricians and Gynecologists recommends endometrial biopsy in premenopausal women with abnormal uterine bleeding who have risk factors for endometrial cancer, such as long-standing endogenous or exogenous hyperestrogenism, polycystic ovary syndrome, tamoxifen therapy, anovulation, nulliparity, obesity, hypertension, and diabetes mellitus 1
Women with Lynch syndrome have a 30-60% lifetime risk of developing endometrial cancer, and screening via endometrial biopsy every 1-2 years starting at age 30-35 years is recommended 2, 4

Office endometrial biopsies have a false-negative rate of approximately 10%, and a negative endometrial biopsy in a symptomatic patient with persistent symptoms should be followed by additional evaluation 2, 3
Hysteroscopy with directed biopsy is more accurate than blind endometrial sampling for detecting focal lesions 1

Neglecting family history, as women with Lynch syndrome or family history of endometrial/colorectal cancer require more vigilant screening 4, 5

The National Comprehensive Cancer Network recommends assessing for risk factors, such as obesity, diabetes, hypertension, anovulation, PCOS, unopposed estrogen exposure, family history of endometrial or colorectal cancer, and known Lynch syndrome, before deciding to perform an endometrial biopsy 1, 2, 4
The American Academy of Family Physicians recommends performing EMB when risk factors are present, intermenstrual bleeding persists, bleeding is unresponsive to medical management, or Lynch syndrome screening is indicated 7