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Related Concept Videos

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
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Endoscopic Procedures II: Colonoscopy01:25

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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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Serum Laboratory Studies, Stool Test, Breath Test01:30

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Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...
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Related Experiment Video

Updated: Jan 16, 2026

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
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Timely Follow-Up After Positive Stool-Based Testing: Evaluating Diagnostic Colonoscopy Delays in Rural and Non-Rural

Anthony J Duncan1, Grayson H Baden1, Sandi Zukanovic1

  • 1Department of Surgery, School of Medicine & Health Sciences, University of North Dakota, Fargo, ND, USA.

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|October 6, 2025
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Summary

Timely colonoscopies are crucial for colorectal cancer (CRC) screening. DNA stool tests provide accessible and prompt follow-up colonoscopies for both rural and non-rural patients.

Keywords:
colorectal cancerdiagnostic colonoscopyrural health disparitiesstool-based testing

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E-Patient Counseling Trial E-PACO: Computer Based Education versus Nurse Counseling for Patients to Prepare for Colonoscopy
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Area of Science:

  • Oncology
  • Public Health
  • Health Services Research

Background:

  • Colorectal cancer (CRC) is a significant cause of cancer mortality in the U.S.
  • Screening hesitancy and long wait times for colonoscopy drive interest in alternative methods like DNA stool testing.
  • Ensuring timely colonoscopy access after positive stool tests is critical, especially for rural populations.

Purpose of the Study:

  • To compare the timeliness of diagnostic colonoscopies following positive stool-based tests between rural and non-rural patients.
  • To assess the accessibility and effectiveness of DNA stool-based testing for colorectal cancer screening across different geographic populations.

Main Methods:

  • An observational case-control study included 1316 patients aged 18+ with positive DNA stool tests undergoing colonoscopy (Jan 2018-Dec 2023).
  • Patients were categorized as rural or non-rural using Rural-Urban Commuting Area (RUCA) codes.
  • The primary outcome measured was the time in days from a positive stool test to diagnostic colonoscopy.

Main Results:

  • No significant difference in median time to colonoscopy between rural (35 days) and non-rural patients (37 days).
  • Rural patients were more likely to have colonoscopies at external facilities (25% vs 3.1%).
  • Overall, follow-up colonoscopy times were comparable, indicating timely access for both groups.

Conclusions:

  • Positive stool-based tests lead to timely diagnostic colonoscopies for both rural and non-rural individuals.
  • DNA stool testing is an effective and accessible screening method for colorectal cancer, supporting its continued use.
  • This approach helps reduce healthcare system burden and improve screening accessibility for diverse patient populations.