A Colonoscopy is a diagnostic procedure test of the large bowel. It shows polyps, cancer, inflammation, bleeding sources; polyps can be removed. No ionising radiation when done without X-ray guidance.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
A Colonoscopy is a diagnostic procedure to examine the large intestine (colon and rectum). It helps identify polyps, cancer, inflammation, and sources of bleeding. Polyps can be removed during the procedure. No ionizing radiation is used when done without X-ray guidance. Colonoscopy shows polyps, cancer, inflammation, and bleeding sources. It is typically performed when there is blood in the stool, changes in bowel habits, or as part of screening. The procedure involves bowel preparation the day before, which involves following clear-fluid diet instructions. Colonoscopy is done without ionizing radiation when not guided by X-ray. It takes about 20 to 45 minutes. The results must be interpreted by a qualified health worker.
Polyps, cancer, inflammation, bleeding sources; polyps can be removed.
Blood in stool, change in bowel habit, screening.
Bowel preparation the day before with a clear-fluid diet, as instructed.
No ionising radiation when done without X-ray guidance.
20 to 45 minutes. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
Diagnostic procedure
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
What does a colonoscopy show?
Polyps, cancer, inflammation, bleeding sources; polyps can be removed.
Why is a colonoscopy done?
Blood in stool, change in bowel habit, screening.
How do I prepare for a colonoscopy?
Bowel preparation the day before with a clear-fluid diet, as instructed.
Does a colonoscopy use radiation?
No ionising radiation when done without X-ray guidance.
How long does a colonoscopy take?
20 to 45 minutes
Why is Colonoscopy done?
Blood in stool, change in bowel habit, screening.
How do I prepare for Colonoscopy?
Bowel preparation the day before with a clear-fluid diet, as instructed.
Is Colonoscopy safe in pregnancy?
No ionising radiation when done without X-ray guidance.
SI text CC BY 4.0; RadiologyInfo.org (ACR/RSNA) and MedlinePlus linked as references only, no text copied.