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Adenoma Detection Rate (ADR)

What is an Adenoma?

Polyps are benign (non-cancerous) growths or projections of tissue that form on the inner lining of the colon.  Different types of Polyps look different under the microscope and cancer can form in some of them.

Villous Adenoma polyp, Atlanta, GAAn Adenoma is a Polyp made up of tissue that looks much like the normal lining of your colon. When the Pathologist studies the removed Adenoma, they look for certain growth patterns that can sometimes tell if it could become cancerous after time. Those with a villous growth pattern (villi-finger-like projections with thin fibro-vascular core) or are larger in size are more likely to have cancers develop in them. The most important thing is that your Polyp has been completely removed and does not show cancer. The growth pattern is only important because it helps determine when you will need your next Colonoscopy to make sure you don’t develop Colon Cancer in the future.

What is Adenoma Detection Rate (ADR)?

Adenoma Detection Rate is the critical standard of care that predicts the risk of Colon Cancer following a Colonoscopy screening. The Adenoma Detection Rate is the proportion of screening Colonoscopies performed by a physician that detect at least one histologically confirmed Colorectal Adenoma. The ADR has been recommended as a quality benchmark by specialty societies and has been recently proposed by the Centers for Medicare and Medicaid Services as a reportable quality measure.

Once the evidence collected after a Colonoscopy, the Adenoma Detection Rate can predict risk of Colorectal Cancer (CRC). You can reliably measure ADR using histology to confirm Adenoma vs. Hyperplastic Polyps.

The Adenoma Detection Rate is determined by the percentage of patients 50 years or older who underwent a first time screening Colonoscopy who had one or more conventional Adenomas detected and removed.

Why Is It Important?

When the Adenoma Detection Rate is high, it can be associated with low “Post Colonoscopy” CRC where CRC’s are found 3 to 4 years after the normal screening Colonoscopy. At GI-North, our doctors report Polyp/Histology results to patients along with recommended time for repeat Colonoscopy.


The purpose of a screening Colonoscopy is to reduce Colorectal Cancer by identifying and removing Adenomas and to identify colon or rectal (referred to as Colorectal) Cancer if it is already present. The most important quality indicator, the Adenoma Detection Rate, is the proportion of average-risk patients in whom a physician identifies Adenomas during Colonsocopy. As you can see from the chart, the physicians at GI North, Dr. Simon Cofrancesco and Dr. Sergio Quijano achieve a much higher Adenoma Detection Rate than the national Benchmark.

GI North is located in Cumming, GA on the campus of Northside Forsyth Hospital. Physicians refer their patients to GI North from all over the Atlanta Metro area including Alpharetta, Milton, Johns Creek, Canton, Roswell, and Suwanee.

© 2016 GI North Gastroenterology Services. All rights reserved.

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