Colorectal · Bedside procedure · London
Rigid sigmoidoscopy, bedside inspection of the rectum and lower sigmoid, no bowel prep.
Rigid sigmoidoscopy is a bedside test that inspects the rectum and lower sigmoid colon (up to ~ 25 cm) with a rigid metal scope — no sedation, no bowel preparation. First-line for haemorrhoids, rectal bleeding and proctitis.
Key facts
- 01
Definition
A bedside rigid inspection of the rectum and lower sigmoid colon.
- 02
5–10 minute test
Quick, chairside procedure in the outpatient clinic.
- 03
No sedation, no bowel prep
Nothing to drink beforehand — you can eat and drive as normal.
- 04
Up to ~ 25 cm from anal verge
Rigid scope reaches the rectum and lower sigmoid colon.
- 05
Biopsies possible
Small tissue samples can be taken during the same visit if needed.
- 06
Complements flexible sigmoidoscopy and colonoscopy
A first-line rectal test — deeper views need a flexible scope.
How it works
From consultation to plan — what happens, in order.
A short, chairside sequence — one consultant, one visit, one clear next step.
- 01
Colorectal consultation
A short consultant colorectal review — symptoms, red flags and examination.
- 02
Left-lateral position
You lie on your left side with knees drawn up — a private, dignified position.
- 03
Digital rectal exam first
A gentle finger examination is always the first step.
- 04
Rigid scope inserted
A slim, lubricated metal scope is passed a short distance into the rectum.
- 05
Inspection ± biopsy
The rectal lining is inspected under light; biopsies are taken only if indicated.
- 06
Photodocumentation
Findings are recorded — images stored with your notes for follow-up.
- 07
Structured plan
A clear next step — banding, biopsy result timing, or onward pathway.
What it shows
When rigid sigmoidoscopy is the right test.
Rigid sigmoidoscopy answers a specific question — what does the rectal and lower-sigmoid lining actually look like, right now. These are the findings we see most.
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Haemorrhoids (grade)
Grades and documents internal haemorrhoids for banding or sclerotherapy planning.
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Anal fissure
Confirms a fissure at the anal verge and its position.
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Rectal polyp
Detects rectal polyps within reach for biopsy or onward removal.
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Rectal cancer (low)
Identifies low rectal tumours that a finger exam may miss.
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Proctitis (ulcerative / infective)
Assesses inflammation pattern — ulcerative colitis vs infective proctitis.
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Solitary rectal ulcer
Identifies the classic anterior rectal ulcer syndrome.
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Rectal prolapse
Assessed with straining in the clinic; confirms full-thickness prolapse.
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Red flag: obstructing rectal mass — urgent MDT
A palpable or visible obstructing mass triggers same-week MDT review.
Test types
Rigid sigmoidoscopy sits inside a family of rectal tests.
What each option on your referral actually looks at, and how far.
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Rigid sigmoidoscopy
Bedside inspection of the rectum and lower sigmoid up to ~ 25 cm.
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Proctoscopy
Shorter anal-canal scope — first-line for haemorrhoids and fissure.
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Rigid + biopsy
Same procedure with targeted rectal biopsies for histology.
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Rigid + rubber-band ligation
Immediate banding of internal haemorrhoids in the same visit.
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Rigid + injection sclerotherapy
Sclerosant injection for grade I–II haemorrhoids under direct vision.
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Flexible sigmoidoscopy
Longer flexible scope reaching the descending colon — needs enema prep.
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Colonoscopy
Full colonic assessment with sedation and bowel prep — the definitive test.
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High-resolution anoscopy
Magnified anal-canal inspection for HPV-related disease.
Our vetted London network
A small panel of colorectal clinics, we picked them.
Consultant colorectal partners across central, north, west and south London. Introductions are made privately, once we understand your case.
Selection criteria
How we choose every clinic in our network.
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Consultant colorectal surgeons or gastroenterologists
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Standardised chairside technique with photodocumentation
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Same-visit histology sent to accredited laboratories
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Onward colonoscopy, MDT or two-week-wait pathway when needed
Safety and eligibility
One of the safest procedures in colorectal medicine.
Rigid sigmoidoscopy is exceptionally safe — the practical points are the position, the chaperone, and where the test’s reach ends.
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No sedation, no bowel prep
Eat, drink and take medication as normal — drive yourself home.
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Painless in most cases
A brief pressure sensation only — the scope is slim and well-lubricated.
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Left-lateral position
Private and dignified — a sheet covers you throughout.
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Chaperone always offered
A clinical chaperone is present or offered for every examination.
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Bleeding risk is minimal
Mild spotting after biopsy is normal; heavy bleeding is rare.
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Perforation risk is very low
Rigid sigmoidoscopy has one of the lowest perforation rates in endoscopy.
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A normal test is not a full colon clear
The rigid scope only reaches ~ 25 cm — colonoscopy is needed for higher lesions.
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Follow-on colonoscopy sometimes needed
A positive finding or ongoing symptoms trigger a full colonoscopy.
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Bring prior colonoscopy reports
Comparison with previous endoscopy sharpens interpretation.
Red flags — refer urgently
- Obstructing rectal mass
- Rectal bleeding with weight loss
- Rectal bleeding + change in bowel habit
- Suspected inflammatory bowel disease flare
- Post-radiotherapy proctitis
- Immunosuppressed proctitis (CMV)
- Rectal foreign body
- Fistula-in-ano with sepsis
- Faecal incontinence with rectal ulcer
Reading your report
A rigid sigmoidoscopy report can look intimidating. It isn’t.
Whatever the finding, the report keeps to the same four parts.
A quiet reminder
The report is written for your doctor, not for you — and that’s normal.
If you would like us to talk you through it before your follow-up, just ask.
- 01 Header
Indication and symptom summary
Your details, the reason for the test, and the red-flag features that shape interpretation.
- 02 Technique
Extent reached and biopsy sites
How far the scope reached, in centimetres, and where any biopsies were taken.
- 03 Findings
Mucosal appearance, lesions and grading
Vessel-by-vessel description of the rectal mucosa, haemorrhoid grade, polyps or ulceration.
- 04 Impression
The conclusion: read this first
Normal, benign, biopsy pending or urgent MDT — the concrete next step, first.
Treatment options
What the scope finds is the start, not the end.
The most common treatments that follow a rigid sigmoidoscopy — usually chairside, sometimes surgical.
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Rubber-band ligation
Elastic bands placed on internal haemorrhoids in clinic — the workhorse for grade II–III disease.
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Injection sclerotherapy
A small sclerosant injection shrinks grade I–II haemorrhoids under direct vision.
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Botox for fissure
Botulinum toxin to the internal sphincter relaxes spasm and heals chronic fissure.
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Topical GTN / diltiazem
First-line topical treatment for anal fissure — heals ~ 50 % of chronic cases.
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Surgical haemorrhoidectomy
For grade IV or refractory disease — day-case surgery under general anaesthetic.
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Rectal cancer pathway
Immediate two-week-wait referral, staging MRI and multi-disciplinary team review.
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Structured colorectal follow-up
Planned interval clinic review after banding, biopsy or IBD induction therapy.
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Multi-disciplinary team review
Colorectal surgeon, oncologist, radiologist and specialist nurse review complex cases together.
Recognised by major UK insurers
Cover depends on your policy and clinic; we confirm with your insurer before booking.
Frequently asked
Everything we get asked about rigid sigmoidoscopy.
Quick answers on prep, pain, biopsy and when a full colonoscopy is the right next step.
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What does a rigid sigmoidoscopy show?
The lining of the rectum and lower sigmoid colon — up to about 25 cm from the anal verge. It identifies haemorrhoids, fissures, polyps, low rectal cancers, proctitis, solitary rectal ulcer and prolapse.
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Do I need bowel prep or sedation?
No. Rigid sigmoidoscopy is a bedside test with no bowel preparation and no sedation. You eat and drink as normal and drive yourself home.
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How is it different from flexible sigmoidoscopy?
A rigid scope reaches ~ 25 cm and needs no prep; a flexible sigmoidoscopy reaches the descending colon (~ 60 cm) and needs an enema. Colonoscopy examines the whole colon and needs full bowel prep.
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Is it painful?
Most patients feel only brief pressure and mild wind sensation. The scope is slim, well-lubricated and in place for only a few minutes.
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Can biopsies be taken?
Yes — small rectal biopsies can be taken during the same visit and sent for histology, with results usually available within a week.
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When would I need a colonoscopy instead?
When symptoms suggest disease higher in the colon — change in bowel habit, iron-deficiency anaemia, weight loss, or a family history of colorectal cancer. NICE NG151 sets out the referral thresholds.
Sources
- British Society of Gastroenterology. Endoscopy standards and guidance.
- NICE. Colorectal cancer (NG151).
- American Society of Colon and Rectal Surgeons. Clinical practice guidelines.
- European Society of Coloproctology. Clinical guidelines.
Last reviewed 2026-07-30 · Next review 2027-07-30 · Reading time ~ 4 min · Clinically reviewed by Pulse Atlas Editorial Board, .
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In practice, in London
The honest picture around rigid sigmoidoscopy in London
With rigid sigmoidoscopy, the London question is usually about report turnaround and the radiologist reading it — not whether the scan is available. Public provision for rigid sigmoidoscopy is competent but constrained by capacity. Private London clinics tend to have shorter diaries and longer appointment slots, so you get the same specialists with more time. For people who’ve been going round in circles with primary care, that first proper conversation is often what shifts things.
The mechanics are straightforward: a consultant appointment, any tests done at a nearby CQC-registered site, and a written report back within a few days. London’s density of private diagnostics — Marylebone, the City, Chelsea, Canary Wharf — means most patients can find something that fits around work without a cross-town trek. For rigid sigmoidoscopy specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.
Where a good concierge earns its keep is in the matching. There are dozens of consultants in London who see rigid sigmoidoscopy — but not all of them are the right fit for every case. We narrow it down based on subspecialty, insurer coverage, the specific question being asked, and whether continuity into treatment matters. The right first appointment saves you from repeating yourself later.
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