Colonoscopy

What is a Colonoscopy?

A colonoscopy is a procedure used to look at the inside of the large bowel (colon). A thin, flexible tube with a camera is passed gently through the back passage and guided around the bowel.

This test may be recommended for screening purposes if you are over age 45 or to help investigate:

  • Rectal bleeding
  • A change in bowel habits
  • Ongoing diarrhoea or constipation
  • Abdominal pain
  • Abnormal scans or test results
  • Known bowel conditions that need follow-up

During the procedure, the doctor may also:

  • Take small tissue samples (biopsies)
  • Remove small growths called polyps

Before Your Procedure

For the doctor to see clearly, the bowel must be properly cleaned out.

You may be asked to:

  • Switch to clear fluids the day before
  • Take bowel preparation medicine (laxatives) exactly as instructed
  • Drink plenty of approved fluids
  • Stop iron tablets before the procedure if advised
  • Contact our office if you take blood thinners, diabetes medication, weight-loss injections, or other important medicines
  • Arrange for an adult to take you home if you will be having sedation

Please note: Careful preparation is very important. If the bowel is not clean enough, the procedure may need to be delayed or repeated.

What to Expect During the Procedure

When you come in, one of our nurses will review your preparation and make sure you feel comfortable and informed before we begin.

During the procedure:

  • You may be offered sedation, pain relief, or gas and air depending on your care plan
  • You will usually lie on your side
  • The colonoscope is passed gently through the back passage into the bowel
  • Air or gas is used to open the bowel slightly so the lining can be seen clearly
  • Biopsies or polyp removal can be done during the same procedure if needed

You may feel:

  • Pressure
  • Cramping
  • Bloating
  • The urge to pass wind

These sensations are common and usually settle quickly.

After the Procedure

After the test:

  • You may feel bloated or crampy for a short time
  • You may pass wind more than usual
  • If biopsies or polyps were removed, you may notice a small amount of blood
  • If you had sedation, you will need an adult to take you home and you should rest for the rest of the day
  • If you had sedation, avoid driving, alcohol, machinery, and important decisions for 24 hours