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Related Experiment Video

Updated: May 26, 2026

Structured Approach to Colonoscopy Technique Optimization: A Single-Center Experience with Novice Endoscopists
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Validation of a novel method for assessing competency in polypectomy.

Sachin Gupta1, Paul Bassett, Ripple Man

  • 1Wolfson Unit for Endoscopy, St. Mark's Hospital and Imperial College London, London, United Kingdom.

Gastrointestinal Endoscopy
|December 14, 2011
PubMed
Summary

The Direct Observation of Polypectomy Skills (DOPyS) tool reliably distinguishes between expert and intermediate endoscopists' polypectomy skills, but only when assessors are trained. This highlights the importance of training for accurate competency assessment in colonoscopy.

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Area of Science:

  • Gastroenterology
  • Medical Education
  • Surgical Skills Assessment

Background:

  • Polypectomy is a crucial skill in colonoscopy for colorectal cancer prevention.
  • Formal assessment of technical skills in polypectomy is currently lacking.
  • Competency assessment in polypectomy is essential for endoscopist certification.

Purpose of the Study:

  • To determine the construct validity of the Direct Observation of Polypectomy Skills (DOPyS) tool.
  • To assess if the DOPyS can reliably differentiate between endoscopists with varying experience levels.

Main Methods:

  • 32 polypectomy videos from expert and intermediate endoscopists were collected.
  • Videos were blindly assessed by 4 experienced endoscopists, 2 trained in DOPyS and 2 untrained.

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  • Construct validity was evaluated by comparing DOPyS scores between expert and intermediate groups.

    • Main Results:

    • Trained assessors using DOPyS reliably distinguished between expert and intermediate endoscopists (P = .049 and P < .001).
    • Expert endoscopists achieved higher competency scores than intermediate endoscopists.
    • Untrained assessors showed no significant difference in distinguishing between experience levels (P = .71 and P = .15).

    Conclusions:

    • The DOPyS tool can reliably differentiate polypectomy skills based on endoscopist experience.
    • Assessor training is crucial for the reliable application of the DOPyS tool.
    • Further studies with larger sample sizes and polyp diversity are warranted.