What OB-GYNs Should Know About ACOG’s Updated Guidance on Postmenopausal Bleeding

The American College of Obstetricians & Gynecologists (ACOG) recently published updated guidelines for evaluating postmenopausal bleeding. The updated guidance reflects rising rates of endometrial cancer and concerns about missed malignancies when relying on ultrasound alone.

ACOG now recommends combined transvaginal ultrasonography (TVUS) and endometrial tissue sampling for most patients presenting with postmenopausal bleeding. 

Here’s what OB-GYNs should know about the updated recommendations and their implications for endometrial cancer detection.

Why the Guidance Changed

Endometrial cancer is the fourth most common cancer in women in the United States, and incidence rates continue to rise. In 2026, the American Cancer Society estimates that there will be about 68,270 new cases, and about 14,450 women will die from endometrial cancer. 

Research shows that approximately 90 percent of women diagnosed with endometrial cancer experience postmenopausal bleeding before diagnosis. Postmenopausal bleeding is vaginal bleeding that occurs a year or more after a patient’s last menstrual bleeding. It can signal vaginal dryness, hormone replacement therapy (HRT), polyps, or cancer.

Prior guidance recommended TVUS alone for low-risk cases with endometrial thickness ≤4 mm. However, new research suggests that ultrasound-only evaluation may miss 5-12 percent of cancers at initial presentation. 

“ACOG’s updated guidance reflects a meaningful shift in how clinicians approach postmenopausal bleeding,” said David Shalowitz, MD, MSHP, FACOG, author of the guidance and a gynecologic oncologist, in a news release. “Current recommendations for using endometrial thickness by ultrasonography as a triage tool are associated with an unacceptably low sensitivity for malignant and premalignant endometrial pathology. By recommending tissue sampling as part of the initial evaluation for most patients, we are giving clinicians a more reliable path to detecting and treating uterine cancer.”

What the Updated Recommendations Say

The new ACOG guidance recommends a combined TVUS and endometrial biopsy as part of the initial evaluation for patients presenting with postmenopausal bleeding. 

According to ACOG, ultrasound-only evaluation may still be appropriate for carefully selected low-risk patients who meet the following criteria:

• Single episode of postmenopausal bleeding
• Fully visualized endometrium
• Endometrial thickness ≤4 mm
• No significant endometrial cancer risk factors
• Reliable access to prompt follow-up care if bleeding occurs

Persistent or recurring bleeding can still warrant histologic evaluation regardless of stripe thickness. ACOG’s guidance encourages OB-GYNs to shift away from using endometrial thickness alone as a primary triage tool.

Clinical Implications for OB-GYNs and Frontline Clinicians

For providers, individualized risk assessments for patients presenting with postmenopausal women — particularly Black women — may be essential for earlier detection and timely referral to specialty care.

Here’s how clinicians can implement the ACOG’s updated clinical guidance:

• Increase the use of office-based endometrial biopsy
• Adapt outpatient gynecology workflows
• Prioritize shared decision-making and patient counseling
• Document rationale for conservative management in “low-risk” patients
• Establish prompt referral pathways for inconclusive biopsy results

Why This Matters for Black Women

“This has particular relevance for Black women, who for a multiplicity of reasons are at risk for being diagnosed with aggressive endometrial cancers that may not be associated with demonstrable ultrasound abnormalities,” said ACOG CEO Sandra E. Brooks, MD, MBA, in a news release.

Black women experience disproportionately higher mortality rates from endometrial cancer and are more likely to be diagnosed with aggressive disease subtypes. The ACOG’s updated guidance underscores why providers should not rely solely on ultrasound alone, as doing so may worsen disparities if follow-up care is delayed or incomplete. Earlier tissue sampling may improve diagnostic accuracy and equity and reduce missed malignancies in high-risk populations.

For clinicians treating Black women, it’s crucial to consider the social determinants of health (SDOH) when assessing the feasibility of follow-up. 

Final Thoughts

The ACOG now favors combined TVUS and endometrial tissue sampling for most postmenopausal bleeding patients. Ultrasound-only evaluation should be reserved for carefully selected low-risk patients, while persistent bleeding should require histologic evaluation regardless of endometrial thickness. This updated guidance can help reduce missed endometrial cancer diagnoses and improve equity in care — especially among Black women.

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