Colonoscopy

A colonoscopy uses a thin, flexible camera to examine the whole lining of your large bowel. It can help find the cause of symptoms such as bleeding, abdominal pain, a change in bowel habit or anaemia. If polyps are found, Dr Ahmad can usually remove them during the same procedure and take biopsies if needed, to help avoid a second visit.

Call 07435 081678

Consultations usually available within 1 to 2 weeks, including evenings and weekends, in person or remotely.

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Colonoscopy

A colonoscopy uses a thin, flexible camera to examine the whole lining of your large bowel. It can help find the cause of symptoms such as bleeding, abdominal pain, a change in bowel habit or anaemia. If polyps are found, Dr Ahmad can usually remove them during the same procedure and take biopsies if needed, to help avoid a second visit.

Specialist colonoscopist at St Mark’s National Bowel Hospital · PhD in
colonoscopy · 4,500+ procedures.

Consultations usually available within 1 to 2 weeks, including evenings
and weekends, in person or remotely.

4.97 Out of 5
Rated on Doctify

22 verified patient reviews

The procedure

Colonoscopy at a glance

The key facts about your colonoscopy with Dr Ahmir Ahmad, from preparation to results.

How long

The examination takes about 30 to 45 minutes.

Your visit

Plan for around half a day, including recovery.

Comfort

Choose from no sedation, light sedation or, at Welbeck London, deeper sedation given by an anaesthetist.

Before

A pre-assessment call, a low-fibre diet, then a bowel-cleansing preparation.

Results

Your report is shared with your secure patient portal on the day. If samples are taken, you’ll have a clinic follow-up about two weeks later.

Where

Welbeck London (Marylebone), Nuffield Health Brentwood Hospital, Spire Hartswood Hospital (Brentwood) and St Mark’s TrustPlus at Northwick Park Hospital (Harrow).

The procedure

What a colonoscopy involves

A clear look at the whole lining of your bowel

A thin, flexible camera is passed through your back passage and gently guided around your large bowel. If Dr Ahmad finds a polyp, he will remove it if it is safe to do so at the time. He can also take small tissue samples (biopsies) for testing.

Dr Ahmad carries out every procedure himself, supported by the hospital’s experienced endoscopy nursing team. The examination takes about 30 to 45 minutes.

  • A pre-assessment call, then a low-fibre diet and bowel preparation
  • Choice of no sedation, light sedation or, at Welbeck London, deeper sedation given by an anaesthetist
  • Home the same day
  • Findings explained and your report shared on the day
Rectum Sigmoid Descending Transverse Ascending Caecum Terminal ileum Scope enters here

In every section, Dr Ahmad looks for polyps, inflammation, bleeding and other changes to the lining.

The procedure

What a colonoscopy involves

A clear look at the whole lining of your bowel

A thin, flexible camera is passed through your back passage and gently guided around your large bowel. If Dr Ahmad finds a polyp, he will remove it if it is safe to do so at the time. He can also take small tissue samples (biopsies) for testing.

Dr Ahmad carries out every procedure himself, supported by the hospital’s experienced endoscopy nursing team. The examination takes about 30 to 45 minutes.

  • A pre-assessment call, then a low-fibre diet and bowel preparation
  • Choice of no sedation, light sedation or, at Welbeck London, deeper sedation given by an anaesthetist
  • Home the same day
  • Findings explained and your report shared on the day
Rectum Sigmoid Descending Transverse Ascending Caecum Terminal ileum Scope enters here

In every section, Dr Ahmad looks for polyps, inflammation, bleeding and other changes to the lining.

Your appointment

What happens on the day

From arrival to going home, plan for around half a day, including preparation, the examination and recovery.

Step 1: Before the day

The pre-assessment team will contact you to go through your medical history and the medicines you take. They’ll explain any changes you need to make to your medicines and how to take your bowel preparation.

Step 2: Arrive and settle in

A nurse will admit you and check your details. Dr Ahmad will explain the procedure, answer your questions and ask for your consent. At Welbeck London, the anaesthetist will also see you to discuss your sedation options.

Step 3: The examination

Dr Ahmad gently guides the colonoscope around your large bowel to examine the lining. You may feel some pressure, bloating or cramping as the bowel is gently inflated with carbon dioxide. Any polyps found are removed if it is safe to do so at the time, and biopsies are taken if needed. If there are multiple or very large polyps, their removal may need to be planned as a separate therapeutic procedure.

Step 4: Recover and go home

You’ll rest in the recovery area, where you can have a drink and a light snack. Dr Ahmad will explain what he found, including any significant findings, and your report will be shared with your secure patient portal. If you had sedation, an adult must take you home, and you shouldn’t drive, drink alcohol or sign important documents for 24 hours.

Why choose Dr Ahmad for colonoscopy?

Expert care, clear answers and support at every step.

  • Consultant-led care

    Dr Ahmad performs your colonoscopy himself. He is a consultant gastroenterologist with a PhD in colonoscopy, has published on the procedure and has carried out more than 4,500 procedures.

  • Treated in one visit

    Polyps are removed during your colonoscopy when it is safe to do so. Multiple or very large polyps may need a separate, planned therapeutic procedure.

  • Your comfort matters

    Dr Ahmad uses modern water-assisted insertion techniques to help improve comfort. You can also choose the level of sedation or pain relief that suits you, and the team will support you throughout.

  • Clear answers on the day

    Dr Ahmad explains the findings before you go home, including anything significant, and your report is shared with your secure patient portal. If samples are taken, he’ll review the results with you in clinic about two weeks later.

Colonoscopy quality you can check

Dr Ahmad’s results from the National Endoscopy Database, January 2025 to October 2026 (421 procedures).

  • Caecal intubation rate

    96%

    How often the camera reaches the far end of the bowel, which is needed to examine the whole colon.

    The standard

    National minimum standard: 90% · aspirational target: 95%

  • Average withdrawal time

    14minutes

    and above 10 minutes in every quarter

    The time spent carefully examining the bowel lining on the way out, when most polyps are found.

    The standard

    National minimum standard: mean of at least 6 minutes · aspirational target: mean of at least 10 minutes

  • Polyp detection rate

    53%

    Polyps can develop into bowel cancer, so finding and removing them matters.

    The standard

    National minimum standard: 15% · aspirational target: 20%

  • Polyp retrieval

    Around99%

    How often removed polyps are recovered and sent to the laboratory. The results guide any further treatment or surveillance.

    The standard

    National minimum standard: 90%

  • Comfort

    Fewer than2%

    with moderate or severe discomfort

    Over 98% of procedures were assessed as causing no more than mild discomfort. Around a third were performed without sedation.

    The standard

    BSG aim: fewer than 10% of patients with moderate or severe discomfort

These figures are from Dr Ahmad’s own audited data and are not a guarantee of individual outcomes.

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Dr Ahmir Ahmad - Gastroenterologist and Endoscopist Profile

Your specialist, Dr Ahmir Ahmad

Consultant Gastroenterologist & Endoscopist

Dr Ahmad qualified in medicine from University College London in 2010. He completed a four year specialist endoscopy fellowship at St Mark’s Hospital from 2018 to 2022, and a PhD at Imperial College London in 2023 focused on improving the quality and efficiency of colonoscopy. His specialist interests include complex polyp removal, endoscopic mucosal resection (EMR) and optical diagnosis. He continues to perform colonoscopy at St Mark’s, the National Bowel Hospital, and has carried out more than 4,500 procedures.

  • Qualifications MBBS, BSc, MRCP, PhD
  • Professional registration GMC 7090128 · Specialist Register
  • Practises at Welbeck London · Nuffield Health Brentwood Hospital · Spire Hartswood Hospital · St Mark’s TrustPlus, Northwick Park Hospital
  • Experience 4,500+ procedures

Medically reviewed by Dr Ahmir Ahmad. Last reviewed 20 October 2026.

Testimonials

What patients say

How patients felt before, during and after their procedure.

“Dr Ahmad is an extremely professional and knowledgeable doctor that instills confidence in his patient. Despite an unexpected event during a colonoscopy he was calm and reassuring and I cannot fault his aftercare.”

Colonoscopy patient Verified · Doctify

“I have absolute faith in Dr Ahmad, he is concise and caring at the same time and always checks to make sure that you know what’s what.”

Colonoscopy patient Verified · Doctify

“Dr Ahmir made me feel so comfortable and safe and informed throughout my consultations and procedure. I was very nervous but his professionalism and care made the entire process very comfortable and I would highly recommend him. Thank you!”

Colonoscopy patient Verified · Doctify

“Dr Ahmad was friendly and professional and very reassuring from the first moment of my consultation, taking time to explain everything. This continued on my procedure day and along with Dr Ahmad, his team at One Wellbeck were all kind and provided the support I needed when I was nervous. Everyone was really great.”

Colonoscopy patient Verified · Doctify

“Dr Ahmad is very professional and has excellent personal skills. I felt immediately impressed and assured on his high level of expertise. Took a good amount of time to throughly look at my issues. Then reacted immediately with a quick plan to move forward. Excellent professional.”

Colonoscopy patient Verified · Doctify

Frequently asked questions

  • A colonoscopy is an examination of the lining of your large bowel (colon) and rectum using a thin, flexible camera. It can find inflammation, bleeding, polyps and other changes. Polyps are removed during the same procedure when it is safe to do so.

  • It can identify bowel polyps, bowel cancer, Crohn’s disease, ulcerative colitis and diverticular disease. It can also help find the cause of bleeding, a change in bowel habit or anaemia.

  • No. You can book a consultation with Dr Ahmad without a GP referral. Any clinic letters will usually be shared with your GP. Procedures are not usually performed without an initial consultation, so Dr Ahmad can check a colonoscopy is right for you. Clinic appointments are usually available within 1 to 2 weeks, with evening and weekend options, and you can choose a face-to-face or remote consultation.

  • Before your procedure, the pre-assessment team will contact you to go through your medical history and medicines. They’ll explain any changes you need to make and how to take your bowel preparation. You’ll follow a low-fibre diet for two days, then take a bowel-cleansing preparation so your bowel is empty. Our bowel preparation page has the full instructions.

  • Most people feel some pressure, bloating or cramping at times. Dr Ahmad uses modern water-assisted insertion techniques, which help improve comfort during the procedure, and sedation or pain relief is also available. Taking biopsies and removing polyps is painless. Tell the team at any time if you feel uncomfortable.

  • This depends on the type of sedation you choose. With conscious sedation, you stay awake but feel relaxed and drowsy, and many people remember little of the procedure afterwards. With deep sedation, available at Welbeck London, an anaesthetist gives you a deeper level of sedation so you are unaware of the procedure, and they will explain the options on the day. Some people choose pain relief alone or no sedation.

  • The examination usually takes about 30 to 45 minutes. Including arrival, preparation and recovery, plan for around half a day.

  • You can usually eat and drink once you are home, starting with something light. If you had sedation, an adult must take you home, and you shouldn’t drive, drink alcohol or sign important documents for 24 hours. Most people are back to normal activities the next day.

  • Dr Ahmad will explain the findings before you go home, including anything significant, and your report will be shared with your secure patient portal on the day. If samples were taken, you’ll have a clinic follow-up about two weeks after the procedure to go through the results.

  • Polyps are removed during the same procedure when it is safe to do so, and sent to the laboratory. Removing polyps is one of the main ways colonoscopy helps prevent bowel cancer. If there are multiple or very large polyps, their removal may need to be planned as a separate therapeutic procedure.

  • Colonoscopy is generally very safe. Some people have bloating or mild cramps afterwards. Rare complications include bleeding, particularly after polyp removal, a tear in the bowel wall (perforation) and a reaction to sedation. Dr Ahmad will explain the risks before you consent.

  • It depends on what is found and on your personal and family history. Many people need no routine repeat after a normal result, while people who had polyps may be advised to return after a set interval. Dr Ahmad will give you a personal recommendation.

  • A colonoscopy examines the whole large bowel. A flexible sigmoidoscopy looks only at the rectum and the lower left side of the bowel, needs lighter preparation and is often done without sedation. A gastroscopy examines the upper digestive tract: the oesophagus (food pipe), stomach and the first part of the small bowel.

  • The price depends on where you have it, the sedation you choose and whether biopsies or polyp removal are needed. You’ll receive a clear written quote before you book. If you have health insurance, check your cover with your insurer first. For a quote, call 07435 081678 or email clinic@drahmirahmad.com.

  • If you are using health insurance, your insurer will usually ask for a procedure code (CCSD code) before authorising your procedure. Because we won’t know until the day whether polyps need to be removed, we recommend asking your insurer to authorise both the diagnostic and the therapeutic code. If you have any questions, Dr Ahmad’s secretary can help.

    ProcedureDiagnostic codeTherapeutic code
    ColonoscopyH2002H2003 (small polyp removal) or H2350 (larger polyp removal)
    Gastroscopy (OGD)G6500G4430
    Gastroscopy and colonoscopy togetherG8082G8083
    Flexible sigmoidoscopyH2502H2503

Get in touch

Have a question about colonoscopy? We’re happy to help.

  • Phone

    07435 081678Dr Ahmad’s secretary, office hours

    Call now
  • Locations

    • Welbeck London, Marylebone
    • Nuffield Health Brentwood Hospital, Brentwood
    • Spire Hartswood Hospital, Brentwood
    • St Mark’s TrustPlus, Northwick Park Hospital, Harrow
  • Email

    Send an email
  • Clinic times

    • Monday
      12:00–14:00Welbeck London
    • Tuesday
      08:00–09:00St Mark’s TrustPlus
    • Wednesday
      10:30–12:00Spire Hartswood
      14:00–16:00Nuffield Health Brentwood
      18:00–20:00Welbeck London
    • Alternate Saturdays
      09:00–11:00Spire Hartswood or Nuffield Health Brentwood

Get in touch

Have a question about colonoscopy? We’re happy to help.

Advice after your procedure

Office hours

Contact Dr Ahmad’s secretary on 07435 081678 or at clinic@drahmirahmad.com.

  • Monday – Friday 9:00am – 5:00pm

Out of hours

Contact the hospital where you were treated for advice:

If you can’t get through to the hospital, call NHS 111.

In an emergency, call 999 or go to A&E, and tell them about your recent procedure.

Looking for a colonoscopy specialist?

See Dr Ahmad at Welbeck London in Marylebone, Nuffield Health Brentwood Hospital or Spire Hartswood Hospital in Brentwood, Essex, or St Mark’s TrustPlus at Northwick Park Hospital in Harrow. Consultations are available in person, by video or by phone.