Pap Smear Test: A Game Changer in Women's Health

Hear from Linda Eckert, MD, FACOG, a leading expert in cervical cancer prevention, on how the Pap test has transformed ob-gyn and cancer screening, the difference it has made for her patients, and what lies ahead.

Few advances in medicine have shaped women’s health as profoundly as the Pap test, commonly called a Pap smear. Introduced in the mid-20th century, this simple screening test transformed cervical cancer from one of the leading causes of cancer death among women into one of the most preventable. Today, it remains a cornerstone of preventive care and a model for early detection across medicine.

How was the Pap test developed?
The Pap test was developed in the 1920s by physician George Papanicolaou, who discovered that cervical cancer could be identified through microscopic examination of cells collected during a routine exam. His insight—that disease could be detected long before symptoms appeared—revolutionized medicine. By 1941, the Pap test was introduced as a standardized screening that could be widely adopted in clinical care.

Why does the Pap test matter?
Cervical cancer typically develops slowly, beginning with precancerous changes that can take years to progress. The Pap test detects these abnormal cells early, allowing clinicians to intervene before cancer develops. This ability to identify disease at its earliest stages is what makes screening so powerful.

What impact does this game changer have and how has it shaped the future of ob-gyn health?
Since widespread Pap test screening began in the 1940s, cervical cancer incidence and mortality in the United States have declined by more than 50%, with reductions of up to 70% linked to regular screening. This outcome is one of the greatest successes in cancer prevention and helped establish screening as a cornerstone of preventive care.

Today, that legacy continues to evolve. HPV testing, alone or in combination with the Pap test, is now recommended as a primary approach to cervical cancer screening, reflecting advances in our understanding of the virus that causes nearly all cervical cancers and pointing the way toward even more effective prevention. Learn more in ACOG’s updated cervical cancer screening guidance.

As we mark ACOG's 75th year, our Game Changers series will highlight breakthroughs that have reshaped ob-gyn care and explore what they mean for the future of health. Stay tuned—a new game changer will be featured each month!