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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:
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...
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...
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,...
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...

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Related Experiment Video

Updated: Jun 2, 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

Colorectal cancer screening.

M Bretthauer1

  • 1Centre for Colorectal Cancer Screening, The Cancer Registry of Norway, Oslo University Hospital, Oslo, Norway. michael.bretthauer@rikshospitalet.no

Journal of Internal Medicine
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

Colorectal cancer (CRC) screening using faecal occult blood tests (FOBT) and flexible sigmoidoscopy effectively reduces mortality. Colonoscopy requires further randomized trials for recommendation.

Related Experiment Videos

Last Updated: Jun 2, 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

Area of Science:

  • Oncology
  • Preventive Medicine
  • Gastroenterology

Background:

  • Colorectal cancer (CRC) is a significant global health concern, being the third leading cause of cancer death.
  • Effective screening strategies are crucial for reducing CRC incidence and mortality.

Purpose of the Study:

  • To review and summarize evidence-based approaches for colorectal cancer screening.
  • To evaluate the effectiveness of various CRC screening tools based on randomized trials.

Main Methods:

  • Systematic review of randomized trials and meta-analyses on CRC screening effectiveness.
  • Categorization of screening tools: early detection (e.g., FOBT) and prevention (e.g., sigmoidoscopy, colonoscopy).

Main Results:

  • Faecal occult blood test (FOBT) screening reduces CRC mortality by 16%.
  • Flexible sigmoidoscopy screening reduces CRC mortality by 30% and is effective for once-only screening.
  • Colonoscopy effectiveness is not yet established through randomized trials.

Conclusions:

  • Faecal occult blood test (FOBT) and flexible sigmoidoscopy are recommended CRC screening methods due to proven mortality reduction.
  • Colonoscopy shows potential but requires rigorous evaluation in randomized trials before recommendation.