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A Barium Enema, or a lower GI series, is a specialized radiographic examination designed to visualize the lower gastrointestinal tract, specifically the colon and rectum. This procedure is instrumental in diagnosing various conditions such as colorectal cancer, polyps, diverticulosis, and inflammatory bowel disease.
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Related Experiment Video

Updated: Jul 16, 2025

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
03:44

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Published on: July 11, 2025

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Interobserver Variation of Bowel Preparation for Colonoscopy.

Hyun Jung Lee1, Bora Keum2, Young-Seok Cho3

  • 1Department of Internal Medicine and Liver Research Institute, Seoul National University College of Medicine, Seoul, Republic of Korea.

Digestive Diseases and Sciences
|September 23, 2023
PubMed
Summary

The Harefield Cleaning Scale (HCS) showed fair interobserver reliability between internal and external endoscopists for assessing bowel preparation quality. However, its reliability may be limited in the left colon.

Keywords:
Bowel preparationColonoscopyHarefield Cleansing ScaleReliability

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Area of Science:

  • Gastroenterology
  • Endoscopy
  • Clinical Practice Guidelines

Background:

  • Bowel preparation scales are crucial for guiding colonoscopy procedures but often lack consistent validation.
  • Assessing the reliability of existing scales is essential for improving clinical practice.

Purpose of the Study:

  • To evaluate the interobserver reliability of the Harefield Cleaning Scale (HCS) between internal and external endoscopists.
  • To determine the HCS's effectiveness in assessing bowel preparation quality during colonoscopies.

Main Methods:

  • A study involving 83 colonoscopy videos was analyzed.
  • Internal endoscopists assessed bowel cleansing during procedures, while external endoscopists reviewed video recordings independently.
  • Cohen's Kappa coefficient was used to quantify interobserver reliability.

Main Results:

  • Fair agreement (Cohen's Kappa = 0.39) was observed between internal and external endoscopists using the HCS.
  • Overall and high-quality bowel preparation rates were excellent and comparable between groups.
  • Slight agreement was found for segmental scores in the descending and sigmoid colon.

Conclusions:

  • The HCS demonstrates fair interobserver reliability but may have limitations in assessing bowel preparation in the left colon.
  • Further validation of the HCS is needed for consistent clinical application, particularly for left-sided colonic segments.