Skip to main content

Tests & diagnostics

Endoscopy risks explained

An honest guide to the risks of gastroscopy and colonoscopy - how rare serious complications are, and the warning signs afterwards.

Published Next review

At a glance

  • Preparation

    Reduce your personal risk before the day: complete the pre-assessment honestly, follow anticoagulant instructions exactly, and do the bowel preparation thoroughly.

  • What happens during the test

    You are monitored throughout - oxygen levels, pulse and blood pressure - with sedation dosing adjusted to you; endoscopists use carbon dioxide insufflation, which reduces discomfort afterwards.

  • Results timeline

    Any procedural complications are apparent immediately or within days; you leave with written guidance on the warning symptoms that need urgent review.

  • Specialist follow-up

    Units run 24-hour advice lines after procedures - severe pain, black stools, significant bleeding or fever warrant immediate contact or emergency care.

What this test is and when it is recommended

Diagnostic endoscopy is very safe. Serious complications of gastroscopy are rare; for diagnostic colonoscopy, perforation occurs in well under one in a thousand cases, with the risk somewhat higher when large polyps are removed - which is also when the benefit is greatest. Sedation-related breathing problems are uncommon and managed by continuous monitoring. Set against this is the risk of not investigating: missed cancers and delayed diagnoses vastly outweigh the procedural risks for patients with genuine indications.

How to access it

Risks specific to you are discussed at consent, whether your procedure is arranged via referral or booked directly self-pay. Where NHS diagnostic waits are frequently lengthy, private slots are usually offered within days to roughly two weeks. Pricing varies by provider.

Frequently asked

Common questions about Endoscopy risks explained.

Quick, plain-English answers to what people ask us most.

  • What is Endoscopy risks explained and what does it show?

    Endoscopy risks explained is an imaging or diagnostic procedure that allows doctors to look at the relevant part of the body in detail, helping to identify or rule out specific problems. It gives information that usually can't be obtained from a physical examination or blood test alone. The findings are interpreted alongside your symptoms and medical history.

  • Why might a doctor request it?

    It's usually requested to investigate specific symptoms, follow up on a previous finding, or check on a known condition. It may also form part of a wider screening or health assessment package. Your doctor will explain what they're hoping to see or rule out before referring you.

  • Do I need to prepare beforehand?

    Preparation varies — some procedures require fasting, a full or empty bladder, stopping certain medications, or avoiding specific products beforehand, while others need no preparation at all. Because requirements are specific to this exact procedure, always follow the instructions given by the clinic at booking rather than assuming. Arriving properly prepared reduces the chance of the appointment needing to be rescheduled.

  • What happens during the procedure?

    You'll usually be guided through each step by trained staff, and most of these procedures are performed with you either lying still, seated, or in a specific position for a short period. Depending on the exact test, it may take anywhere from a few minutes to around an hour. Staff will explain what to expect and answer any questions before you begin.

  • Is it painful, and are there any risks?

    Many imaging procedures are painless or involve only mild, brief discomfort, though some more invasive tests may involve sedation or a small associated risk that will be explained beforehand. Serious complications are uncommon with modern techniques and experienced practitioners. You'll be given specific information about risks relevant to your particular procedure and health background before you consent.

  • How long does it take to get results?

    Results are typically reviewed by a specialist and reported within a few working days, though timeframes can vary depending on complexity. Some findings may be discussed with you immediately after the procedure, with a full written report to follow. The clinic will confirm the expected timeframe when you book.

  • What happens if something abnormal is found?

    If the results show something unexpected, a specialist will explain what it means and recommend appropriate next steps, which might include further imaging, a biopsy, or referral to a relevant specialist. Many abnormal findings turn out to be minor or unrelated to any symptoms once fully assessed. You'll be talked through the findings rather than left to interpret a report alone.

  • Is this available on the NHS, or is private quicker?

    This type of procedure is generally available on the NHS, but routine referrals can involve a wait for both the appointment and the results. Private providers typically offer appointments within days and results reviewed by a specialist soon after, which can be helpful if you want quicker reassurance or a second opinion. Cost for private testing varies by provider.

  • How accurate is this type of test?

    When performed by trained specialists on appropriate equipment, this is generally considered a reliable and clinically well-established investigation. As with any single test, results are best interpreted alongside your symptoms and other findings rather than in isolation. If a result is unclear or unexpected, further imaging or a repeat test may be recommended.

  • How do I book Endoscopy risks explained privately?

    You can usually book directly with a private clinic, often without needing a GP referral, with appointments typically available within a matter of days. It's worth asking about preparation requirements and what the appointment will involve when you book. Contact the clinic for current availability and to discuss any specific concerns.