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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

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The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and...
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Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy01:26

Endoscopic Procedures IV: Sigmoidoscopy and Laproscopy

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Sigmoidoscopy and laparoscopy are distinct medical procedures that enable physicians to internally inspect different parts of the GI tract. Although they serve different purposes, each is essential for diagnosing and, in some cases, treating various medical conditions.
Sigmoidoscopy
Sigmoidoscopy is a diagnostic procedure that uses a flexible sigmoidoscope equipped with a light source and camera to examine the rectum and sigmoid colon. The procedure involves inserting the tube through the anus...
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Endoscopic Procedures III: Video Capsule Endoscopy01:28

Endoscopic Procedures III: Video Capsule Endoscopy

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Capsule endoscopy, or wireless or video capsule endoscopy, is a diagnostic procedure for examining the entire gastrointestinal tract. Patients swallow a capsule about the size of a vitamin tablet. The capsule is equipped with a transmitter, a battery, an LED light source, and a color video camera to capture images throughout the gastrointestinal tract. This procedure is particularly useful for diagnosing conditions such as Crohn's disease, ulcerative colitis, tumors, polyps, ulcers,...
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Endoscopic Procedures I: Esophagogastroduodenoscopy01:29

Endoscopic Procedures I: Esophagogastroduodenoscopy

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An Esophagogastroduodenoscopy (EGD) is a diagnostic procedure in which an endoscopist uses a flexible, lighted endoscope to visualize the upper gastrointestinal (GI) tract. The procedure includes visualizing the oropharynx, esophagus, stomach, and the first part of the small intestine, the duodenum.
During an EGD, the endoscope can be used to:
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Endoscopic Studies I: Bronchoscopy and Thoracoscopy01:30

Endoscopic Studies I: Bronchoscopy and Thoracoscopy

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Endoscopy is a non-surgical medical technique used to examine a person's internal organs and vessels. This lesson will focus on two types of endoscopic studies: bronchoscopy and thoracoscopy.
Bronchoscopy
Description
Bronchoscopy is a procedure that involves direct visualization of the larynx, trachea, and bronchi for diagnostic and therapeutic purposes. A flexible fiber optic or rigid bronchoscope is used to carry out the procedure. The fiber-optic bronchoscope is more frequently used due...
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Related Experiment Video

Updated: Apr 15, 2026

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

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The big picture: does colonoscopy work?

David G Hewett1, Douglas K Rex2

  • 1School of Medicine, The University of Queensland, Brisbane, QLD 4006, Australia; Department of Gastroenterology, Queen Elizabeth II Jubilee Hospital, Brisbane, QLD 4108, Australia.

Gastrointestinal Endoscopy Clinics of North America
|April 4, 2015
PubMed
Summary
This summary is machine-generated.

Colonoscopy is a leading colorectal cancer screening method in the US, but lacks randomized trial support. While observational data show its protective effects, success in the proximal colon varies by operator skill.

Keywords:
Adenoma detectionColonoscopyColorectal cancerColorectal cancer screeningInterval cancer

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Area of Science:

  • Gastroenterology
  • Preventive Medicine
  • Oncology

Background:

  • Colonoscopy is the primary screening strategy for average-risk colorectal cancer in the United States.
  • Despite its widespread use, colonoscopy lacks support from randomized controlled trials.
  • Observational data suggest colonoscopy and polypectomy reduce colorectal cancer incidence and mortality.

Purpose of the Study:

  • To evaluate the effectiveness of colonoscopy in colorectal cancer screening.
  • To assess the variability in colonoscopic protection against colorectal cancer, particularly in the proximal colon.
  • To inform quality improvement initiatives for colonoscopy practices.

Main Methods:

  • Review of observational data on colonoscopy and polypectomy effectiveness.
  • Analysis of factors influencing colonoscopy efficacy, including operator dependency.
  • Consideration of regulatory and behavioral factors in physician practice.

Main Results:

  • Colonoscopy and polypectomy demonstrate a protective effect against colorectal cancer incidence and mortality.
  • The protective benefit of colonoscopy in the proximal colon is variable and influenced by the endoscopist's skill.
  • High-level detection during colonoscopy remains highly effective.

Conclusions:

  • Colonoscopy is a valuable tool for colorectal cancer screening, supported by observational evidence.
  • Quality improvement efforts should focus on standardizing and enhancing colonoscopic detection, especially in the proximal colon.
  • Regulatory factors may play a role in motivating physician behavior to improve colonoscopy quality and outcomes.