Gastroenterology• Updated 21 October 2026
Sigmoidoscopy
A shorter camera test that looks at the rectum and lower part of the large bowel.
Results: Same day
Quick Summary
Primary Purpose
To investigate rectal bleeding and changes in bowel habit.
What It Measures
The lining of the rectum and sigmoid colon.
Preparation
An enema or laxative beforehand.
Overview
It's quicker than colonoscopy and often done without sedation.
It can't see the whole bowel.
What It Measures
Lower bowel
Piles, inflammation, polyps.
How It's Performed
- 01
Prep
Enema before.
- 02
Procedure
Camera through the bottom, 10–20 minutes.
- 03
Afterwards
Return to normal.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Colorectal Cancer Screening Tests(opens in a new tab) · MedlinePlus, US National Library of Medicine
- Bowel cancer screening(opens in a new tab) · NHS