Colonoscopy

A colonoscopy is a visual examination of the colon (large bowel). 

It is performed using a thin flexible tube containing a fibreoptic light and camera (known as a colonoscope).

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Why is colonoscopy performed?

Colonoscopy can be performed to investigate the following:

  • symptoms such as bleeding from the anus (rectal bleeding), change in bowel habit, abdominal discomfort, unexplained weight loss

  • a positive stool test (known as a Faecal Occult Blood Test, FOBT), such as the National Bowel Cancer Screening test

  • patients who have an increased risk of bowel conditions, such as a family history of certain conditions

  • a recommendation based on previous colonoscopy findings

Colonoscopy may show polyps, other growths or inflammation. 

Tissue samples (biopsies) can be taken of any unusual findings and polyps can be removed. 

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Before a colonoscopy

Your bowel needs to be cleared of stool before a colonoscopy.  This process is not pleasant, but necessary to perform colonoscopy safely and obtain optimal views of the bowel.  You will be provided with verbal and written instructions about this process before your procedure.

You will need to have an empty stomach before colonoscopy, to prevent vomiting during the procedure.  You will be advised how long to fast (not eat or drink) before colonoscopy. 

If you take medications, have allergies or other medical conditions, Dr Zhu will provide individualized advice regarding this prior to the procedure.

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After a colonoscopy

Colonoscopy is performed as a day procedure.  It is usually performed with light sedation administered by an anaesthetist.  

You are usually allowed to eat and drink after the procedure. 

However, you should not drive, travel alone on public transport, operate machinery, sign legal documents or drink alcohol for 24 hours after the procedure.

You may feel minor abdominal discomfort and bloating after the procedure.  This is usually due to medical gas placed into the bowel during the colonoscopy.  Your body will evacuate this gas via natural measures, which will result in improvement in the bloating and discomfort.

Dr Zhu will discuss the findings of your procedure with you on the day and will arrange further follow up as appropriate.

Dr Zhu can determine if this procedure is appropriate for you and individualise it based on your medical profile.