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Tests & diagnostics

Endoscopic ultrasound (EUS)

Endoscopic ultrasound - the camera-plus-scanner test for the pancreas, bile duct and gut wall, and the needle biopsies it makes possible.

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At a glance

  • Preparation

    Fast for six hours beforehand; the procedure is done under sedation, so arrange an escort and a day off driving.

  • What happens during the test

    An endoscope with an ultrasound probe at its tip scans from inside the stomach and duodenum, sitting millimetres from the pancreas; fine-needle samples can be taken through the scope, all within 20 to 45 minutes.

  • Results timeline

    Imaging findings are explained the same day; needle biopsy cytology typically reports within one to two weeks.

  • Specialist follow-up

    Results feed into specialist and multidisciplinary team decisions, particularly for pancreatic lesions, cysts and staging questions.

What this test is and when it is recommended

Endoscopic ultrasound produces the most detailed images available of the pancreas and bile duct because the probe examines them from just across the gut wall, unimpeded by bowel gas or body fat. It characterises pancreatic cysts and masses, finds tiny bile duct stones that other scans miss, stages some cancers, and assesses lumps within or pressing on the gut wall. Its decisive advantage is tissue: EUS-guided fine-needle biopsy converts an imaging suspicion into a definitive diagnosis.

How to access it

EUS is available at specialist private units via consultant referral, usually following an initial gastroenterology consultation. NHS waiting lists for diagnostics are often long, while private appointments are typically available within days to around two weeks. Costs vary by provider.

Frequently asked

Common questions about Endoscopic ultrasound (EUS).

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

  • What is Endoscopic ultrasound (EUS) and what does it show?

    Endoscopic ultrasound (EUS) 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 Endoscopic ultrasound (EUS) 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.