Endoscopy

What is Endoscopy?

Endoscopy is a medical procedure that allows a doctor to look inside the body using a thin, flexible tube with a light and a camera, known as an endoscope. The camera transmits images to a screen, enabling direct visualisation of internal organs and structures without the need for large surgical incisions.


Endoscopy is most commonly used to examine the gastrointestinal tract, including the oesophagus, stomach, and intestines. Procedures such as Gastroscopy and Colonoscopy are widely performed for both diagnostic and therapeutic purposes.


Beyond the digestive system, endoscopy can also be used in other areas of the body, including the airways (bronchoscopy), urinary tract (cystoscopy), and joints (arthroscopy).


Who is Suitable for Endoscopy?

Endoscopy is suitable for a wide range of patients, particularly those with symptoms affecting the digestive system or other internal organs.

Patients who may benefit include:

  • Persistent digestive symptoms: Such as ongoing abdominal pain, bloating, nausea, vomiting, or unexplained weight loss
  • Reflux or swallowing difficulties: Commonly investigated with Gastroscopy
  • Changes in bowel habits: Including diarrhoea, constipation, or blood in the stool, often assessed with Colonoscopy
  • Unexplained anaemia: Particularly iron deficiency anaemia, where gastrointestinal bleeding is suspected
  • Screening and surveillance: For conditions such as colorectal cancer or polyps, especially in patients over 45–50 years or with a family history
  • Follow-up of known conditions: Such as ulcers, inflammatory bowel disease, or Barrett’s oesophagus


Endoscopy is also appropriate for patients who require treatment during the same procedure, such as:

  • Removal of polyps or foreign bodies
  • Control of bleeding (e.g., ulcers or varices)
  • Dilation of narrowed areas (strictures)


However, not all patients are immediately suitable. A doctor will assess factors such as:

  • Overall health and fitness for sedation
  • Presence of severe heart or lung conditions
  • Bleeding disorders or anticoagulant use


In most cases, endoscopy is safe and well-tolerated, particularly when performed in a controlled clinical setting.


Benefits of Endoscopy

Endoscopy offers several significant advantages compared to traditional surgical or imaging approaches.

  • Minimally invasive: No large incisions are required, reducing pain and recovery time
  • Accurate diagnosis: Direct visualisation provides more precise information than many imaging tests
  • Early detection: Conditions such as cancer, ulcers, or inflammation can be identified at an early stage
  • Simultaneous treatment: Procedures like polyp removal, biopsy, or bleeding control can be performed immediately
  • Reduced hospital stay: Many endoscopic procedures are performed as day cases
  • Faster recovery: Most patients return to normal activities within 24–48 hours
  • Lower complication rates: Compared to open or laparoscopic surgery


From a clinical perspective, endoscopy is particularly valuable because it allows doctors to both confirm a diagnosis and initiate treatment without delay. This can significantly improve patient outcomes, especially in conditions where early intervention is critical.


Types of Endoscopy

There are several types of endoscopy, each designed to examine a specific part of the body.


Gastrointestinal Endoscopy

  • Gastroscopy: Examines the oesophagus, stomach, and upper small intestine
  • Colonoscopy: Evaluates the large intestine and rectum
  • Sigmoidoscopy: Focuses on the lower part of the colon


Other Specialised Endoscopic Procedures

  • Endoscopic ultrasound (EUS): Combines endoscopy with ultrasound imaging for deeper tissue assessment
  • Endoscopic retrograde cholangiopancreatography (ERCP): Used to diagnose and treat bile duct and pancreatic conditions


Alternative Options to Endoscopy

While endoscopy is often the most direct and informative investigation, alternative options may be appropriate depending on the clinical situation.


Imaging-Based Alternatives

  • CT scan (Computed Tomography): Provides detailed cross-sectional images of internal organs
  • MRI (Magnetic Resonance Imaging): Useful for soft tissue evaluation without radiation
  • Ultrasound: Commonly used for abdominal or pelvic assessment


These imaging techniques are non-invasive but do not allow for biopsy or direct treatment.


Functional and Non-Invasive Tests

  • Stool tests: Can detect blood, infection, or inflammation in the gastrointestinal tract
  • Breath tests: Used for conditions such as Helicobacter pylori infection or lactose intolerance
  • Blood tests: May indicate inflammation, anaemia, or organ dysfunction


Capsule Endoscopy

  • Capsule endoscopy: Involves swallowing a small camera capsule that takes images of the digestive tract, particularly the small intestine


Although capsule endoscopy is less invasive, it has limitations:

  • No ability to perform a biopsy or treatment
  • Less control over image direction
  • May miss certain lesions compared to traditional endoscopy
  • If pathology found, would require conventional endoscopy to reach pathology for definitive management.


Watchful Waiting or Medical Management

In some cases, symptoms may initially be managed with medication or lifestyle changes before proceeding to endoscopy.


Preparation Before an Endoscopy

Proper preparation is essential to ensure a safe, accurate, and effective endoscopy. The exact instructions may vary depending on the type of procedure, such as a Gastroscopy or Colonoscopy.

  • Fasting: You will usually be asked not to eat or drink for at least 6–8 hours before the procedure. This ensures a clear view and reduces the risk of aspiration.
  • Bowel preparation (for colonoscopy): A special laxative solution is taken to completely empty the bowel. This is critical for the accurate detection of polyps or abnormalities.
  • Medication adjustments: Certain medications may need to be stopped or modified, particularly blood thinners, diabetes medications, or iron supplements.
  • Medical history review: Inform your doctor about allergies, previous reactions to sedation, or chronic conditions such as heart or lung disease.
  • Consent and explanation: The procedure, benefits, and risks will be discussed, and you will be asked to sign a consent form.
  • Arrange transport: As sedation is commonly used, you will need someone to drive you home after the procedure.


In most cases, clear written instructions are provided in advance to ensure you are well-prepared.


Endoscopy Procedure

Endoscopy is typically performed in a hospital or specialised clinic and is generally a quick and well-controlled procedure.

  • Sedation or anaesthesia: Most patients receive light sedation to ensure comfort. In some cases, a throat spray (for gastroscopy) or deeper sedation may be used.
  • Positioning: You will lie on your side, and monitoring equipment will track your heart rate, oxygen levels, and blood pressure.
  • Insertion of the endoscope:
  • For Gastroscopy, the endoscope is passed gently through the mouth into the oesophagus and stomach
  • For Colonoscopy, it is inserted through the rectum into the colon
  • Visual examination: The doctor carefully examines the lining of the organ, looking for inflammation, ulcers, bleeding, or growths
  • Biopsy or treatment: Small tissue samples may be taken, or procedures such as polyp removal or bleeding control may be performed
  • Duration: Most procedures take between 15 and 45 minutes


Patients are usually comfortable and often have little or no memory of the procedure due to sedation.


What to Expect After an Endoscopy?

Recovery after an endoscopy is generally quick, but there are a few important points to understand.

  • Short recovery period: You will be monitored in a recovery area until the sedation wears off (usually 30–60 minutes)
  • Temporary side effects:
  • Mild bloating or cramping (especially after a colonoscopy)
  • Sore throat (after gastroscopy)
  • Drowsiness or fatigue from sedation
  • Eating and drinking: Most patients can resume normal eating within a few hours, unless otherwise advised
  • Results discussion:
  • Preliminary findings are often discussed on the same day
  • Biopsy results may take several days
  • Activity restrictions: Avoid driving, operating machinery, or making important decisions for 24 hours after sedation
  • Return to normal routine: Most people resume usual activities the following day


Your doctor will provide clear instructions on what to watch for and when to seek medical attention.


Endoscopy Prognosis

The prognosis following an endoscopy is generally excellent, particularly because the procedure enables early detection and timely treatment of many conditions.

  • Early diagnosis improves outcomes: Conditions such as ulcers, polyps, or early-stage cancers can be identified and treated promptly
  • Therapeutic success: Many issues (e.g., bleeding, polyps) can be treated during the same procedure, reducing the need for surgery
  • Ongoing monitoring: Patients with chronic conditions (such as inflammatory bowel disease or Barrett’s oesophagus) benefit from regular surveillance
  • High accuracy: Endoscopy is one of the most reliable tools for diagnosing gastrointestinal conditions


In most cases, patients gain reassurance when results are normal, or benefit from early intervention when abnormalities are found.


Endoscopy Risks

Endoscopy is considered a safe procedure, but like all medical interventions, it carries some risks. These are generally uncommon.

  • Bleeding: May occur, especially after biopsy or polyp removal
  • Perforation: A rare but serious complication where a small tear occurs in the organ wall
  • Infection: Uncommon due to strict sterilisation protocols
  • Sedation-related risks: Including breathing difficulties or allergic reactions, particularly in patients with underlying health conditions
  • Temporary discomfort: Such as bloating, cramping, or throat irritation


Most complications are rare, and the procedure is widely regarded as low-risk when performed by experienced clinicians.


Patients should seek urgent medical attention if they experience:

  • Severe abdominal pain
  • Persistent vomiting
  • Fever
  • Heavy bleeding


What if Endoscopy is Delayed?

Delaying an endoscopy can have varying consequences depending on the underlying condition being investigated.

  • Missed or delayed diagnosis: Serious conditions such as gastrointestinal cancers or bleeding disorders may go undetected
  • Progression of disease: Conditions like ulcers, polyps, or inflammation may worsen over time
  • Increased complications: Untreated issues may lead to bleeding, obstruction, or infection
  • Reduced treatment options: Early-stage conditions are often easier to treat than advanced disease


However, not all delays are harmful. In some low-risk situations, symptoms may be monitored or managed conservatively before proceeding to endoscopy.

A balanced approach is important:

  • Urgent symptoms (e.g., bleeding, weight loss, anaemia): Require prompt investigation
  • Mild or stable symptoms: May be safely observed with medical guidance