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Related Concept Videos

Endoscopic Procedures II: Colonoscopy01:25

Endoscopic Procedures II: Colonoscopy

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:
Serum Laboratory Studies, Stool Test, Breath Test01:30

Serum Laboratory Studies, Stool Test, Breath Test

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...
Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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 solid...
Assessment of the Rectum and Anus01:25

Assessment of the Rectum and Anus

Evaluating the rectum and anus plays a crucial role in conducting a thorough physical examination of the gastrointestinal system. Although it may be uncomfortable and often embarrassing for the patient, it holds immense diagnostic value, particularly in detecting gastrointestinal diseases and abnormalities. This guide will explain how to perform this assessment using inspection and palpation methods.
Rectal Inspection
Begin by inspecting the perianal and anal areas for color, texture, rashes,...
Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...

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Related Experiment Video

Updated: Jul 7, 2026

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
07:35

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection

Published on: June 8, 2020

Screening for colorectal cancer.

Jack S Mandel1

  • 1Department of Epidemiology, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Room 430, Atlanta, GA 30322, USA. jsmande@sph.emory.edu

Gastroenterology Clinics of North America
|March 4, 2008
PubMed
Summary

Current colon cancer screening methods vary in effectiveness. Researchers seek a simple, noninvasive test to identify individuals needing further colonoscopy surveillance for colorectal cancer or advanced adenomas.

Area of Science:

  • Gastroenterology
  • Oncology
  • Medical Diagnostics

Background:

  • Colorectal cancer screening is crucial for early detection and prevention.
  • Existing screening methods, including fecal occult blood tests, sigmoidoscopy, colonoscopy, CT colonography, capsule endoscopy, and barium enema, have limitations.
  • There is a need for an optimal screening test that is simple, inexpensive, noninvasive, and sensitive.

Purpose of the Study:

  • To review current methods for colorectal cancer screening.
  • To highlight the need for improved screening strategies.
  • To discuss the potential for new marker identification.

Main Methods:

  • Literature review of existing colon cancer screening modalities.
  • Analysis of the advantages and disadvantages of each screening method.

Related Experiment Videos

Last Updated: Jul 7, 2026

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection
07:35

Evaluation of Colorectal Cancer Risk and Prevalence by Stool DNA Integrity Detection

Published on: June 8, 2020

  • Discussion of the requirements for an ideal screening test.

    • Main Results:

    • Multiple screening options exist, but none are considered optimal.
    • Fecal occult blood tests, flexible sigmoidoscopy, colonoscopy, CT colonography, capsule endoscopy, and double contrast barium enema are reviewed.
    • A need for a simple, inexpensive, noninvasive, and sensitive screening test is identified.

    Conclusions:

    • Current screening strategies for colorectal cancer are effective but not ideal.
    • Further research into novel biomarkers is necessary for improved screening performance.
    • Until better tests are available, existing screening methods remain valuable for identifying at-risk individuals.