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Study examines quality of colonoscopy reporting and performance

Underscores the importance of implementing colonoscopy quality indicators and guidelines

Researchers in the Netherlands assessed the quality of colonoscopy reporting in daily clinical practice and evaluated the quality of colonoscopy performance.

They found that colonoscopy reporting varied significantly in clinical practice. Colonoscopy performance met the suggested standards, however, considerable variability between endoscopy departments was found. Researchers concluded that the results of the study underline the importance of the implementation of quality indicators and guidelines, and that by continuous monitoring of quality parameters, the quality of both colonoscopy reporting and colonoscopy performance can easily be improved.

The study appears in the January issue of GIE: Gastrointestinal Endoscopy, the monthly peer-reviewed scientific journal of the American Society for Gastrointestinal Endoscopy (ASGE).

Quality assurance in endoscopy has become an important topic in recent decades. The implementation of colorectal cancer screening has driven a significant portion of these quality initiatives in colonoscopy. Suggested quality indicators for colonoscopy include, among others, cecal intubation rate, adenoma detection rate (ADR), and withdrawal time. Without complete and accurate reporting of colonoscopy parameters, continuous quality assurance is meaningless because deficits in service and quality improvements over time cannot be identified. By determining underlying reasons for quality deficits, specific training and education projects can be implemented to achieve the maximum benefit from colonoscopic procedures.

"Studies of quality indicators focus to a great extent on single quality indicators and often show the results of quality assurance in nondaily clinical practice, such as screening programs and study settings, where endoscopists were aware of the quality audit or were obliged to complete automated colonoscopy reporting systems. Less is known about the compliance with colonoscopy reporting and performance in daily clinical practice," said study lead author Vincent de Jonge, MSc, Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, the Netherlands. "Our study examined both reporting and performance in daily practice. We found that reporting varied significantly in clinical practice and that while performance met the suggested standards, there was considerable variability between endoscopy departments."


This study took place in the daily clinical practice of 12 endoscopy departments in the Netherlands (six teaching hospitals and six general hospitals). At the time of the study, there was no comprehensive quality assurance program either nationwide or at any of the endoscopy departments individually, although over the past 15 years, the Dutch Society of Gastroenterologists has put in place and maintained a quality audit system for endoscopy units. This system requires that endoscopy units and their staff undergo a thorough quality audit every five years according to a fixed format by trained external auditors from the Dutch Society. The audit focuses on, for example, organizational aspects of the units, case mix, number of endoscopy procedures performed, waiting lists, and complication registration, but not on specific performance indicators of individual endoscopists such as those investigated in this study (i.e., cecal intubation rate and ADR). The staff of each participating endoscopy department was informed about the study protocol and parameters of interest, and ethical approval was obtained from each institutional review board. During the study period, colonoscopies and colonoscopy reporting were performed according to local protocols.

A total of 4,800 colonoscopy reports were included covering scheduled colonoscopies on 4,738 patients. Reports were reviewed by hand. Quality of reporting was assessed by using the American Society for Gastrointestinal Endoscopy criteria for colonoscopy reporting. Quality of colonoscopy performance was evaluated by using cecal intubation rate and ADR.


The 4,800 colonoscopies were performed by 116 endoscopists: 70 percent by gastroenterologists, 16 percent by gastroenterology fellows, 10 percent by internists, 3 percent by nurse-endoscopists, and 1 percent by surgeons. The mean age of the patients was 59 years old and 47 percent were male. Reports contained information on indication, sedation practice, and extent of the procedure in more than 90 percent. Only 62 percent of the reports mentioned the quality of bowel preparation (range between departments was 7 to 100 percent). Photographic documentation of the cecal landmarks was present in 71 percent (range was 22 to 97 percent). The adjusted cecal intubation rate was 92 percent (range was 84 to 97 percent) and the ADR was 24 percent (range was 13 to 32 percent).

The researchers concluded that overall, the quality of colonoscopy reporting was high, although significant variability existed. This variance suggests that, with a relatively small amount of effort, the quality of reporting can be improved significantly. This may be achieved with the widespread introduction of computerized image storage and endoscopy reporting, and also has the potential to be cost-saving compared with handwritten or dictated reports. The overall quality of colonoscopy performance reached international standards, although remarkable variability between endoscopy departments was found. By continuous quality monitoring and disclosure of results, the overall quality of performance can be further improved. This study emphasizes that national guidelines for both colonoscopy performance and reporting parameters are needed to set common targets for the quality of colonoscopy, thereby improving uniformity in daily clinical practice of both colonoscopy reporting and colonoscopy performance.

In an accompanying editorial, David A. Johnson, MD, FACG, FASGE, Department of Internal Medicine Gastroenterology Division, Eastern VA Medical School, Norfolk, Virginia, states, "The results of this study highlight several important points. First, there is clearly room for significant improvement, both for reporting and performance of colonoscopy. Second, despite the use of the quality metrics, there was not consistent use nor was there any improvement even when the endoscopists knew that they were being evaluated. This suggests that the process perhaps needs to be better standardized via an electronic report with required fields. What the study does not address is whether this information was to be used in feedback to the individual endoscopists as part of a quality improvement program, which clearly should be the intent of comparative metrics."

About the American Society for Gastrointestinal Endoscopy

Since its founding in 1941, the American Society for Gastrointestinal Endoscopy (ASGE) has been dedicated to advancing patient care and digestive health by promoting excellence in gastrointestinal endoscopy. ASGE, with nearly 12,000 members worldwide, promotes the highest standards for endoscopic training and practice, fosters endoscopic research, recognizes distinguished contributions to endoscopy, and is the foremost resource for endoscopic education. Visit and for more information and to find a qualified doctor in your area.
About Endoscopy

Endoscopy is performed by specially-trained physicians called endoscopists using the most current technology to diagnose and treat diseases of the gastrointestinal tract. Using flexible, thin tubes called endoscopes, endoscopists are able to access the human digestive tract without incisions via natural orifices. Endoscopes are designed with high-intensity lighting and fitted with precision devices that allow viewing and treatment of the gastrointestinal system.

Anne Brownsey | EurekAlert!
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