What is a colonoscopy? A parent's guide

If your child has Crohn's disease or ulcerative colitis, you may hear their healthcare team talk about having a colonoscopy. Your child might need one to help diagnose inflammatory bowel disease (IBD), investigate symptoms or check how well their treatment is working.

It is completely understandable to have questions or feel worried when your child needs a procedure. You may wonder whether it will hurt, what the doctors are looking for and how your child will feel afterwards.

This guide explains what a colonoscopy involves, why it is used in children with IBD and what you can expect before, during and after the procedure.

🩺 What is a colonoscopy?

A colonoscopy is a medical procedure that allows a doctor to look inside the large intestine, also called the colon.

The doctor uses a thin, flexible tube called a colonoscope. It has a small camera and light at the end, which sends images to a screen so the doctor can examine the lining of the bowel.

During the procedure, the doctor may also examine the end of the small intestine, called the terminal ileum, if this is appropriate and possible.

Tiny tissue samples, known as biopsies, can be taken during the examination. These samples are sent to a laboratory, where they are examined under a microscope.

A colonoscopy helps doctors see changes in the bowel lining that may not be detected through blood tests or symptoms alone.

🔍 Why might a child with IBD need a colonoscopy?

There are several reasons why a gastroenterologist might recommend a colonoscopy for a child.

To help diagnose IBD

If a child has ongoing diarrhoea, abdominal pain, blood in their stool, unexplained weight loss or other concerning symptoms, a colonoscopy can help investigate the cause.

The doctor looks for signs of inflammation and takes biopsies to help distinguish Crohn's disease, ulcerative colitis and other conditions.

A diagnosis is usually based on a combination of symptoms, blood and stool tests, endoscopy, biopsy results and sometimes imaging.

To assess inflammation

A colonoscopy can show whether the bowel lining is inflamed and how much of the intestine is affected.

This information can help the healthcare team understand the severity and extent of your child's disease.

To check how well treatment is working

Even when a child feels better, there may still be inflammation in the bowel. A colonoscopy can help determine whether treatment has reduced the inflammation and whether the lining is healing.

To investigate new or worsening symptoms

If your child's symptoms change or their healthcare team needs more information about their condition, further investigation may be recommended.

Not every flare requires a colonoscopy. The decision depends on your child's symptoms, previous results and the information the team needs.

🧪 What is the difference between a colonoscopy and an endoscopy?

You may hear healthcare professionals use the terms colonoscopy, endoscopy and gastroscopy. They are related procedures, but they examine different parts of the digestive system.

• Colonoscopy: Examines the large intestine and sometimes the end of the small intestine. The scope enters through the anus.

• Upper endoscopy or gastroscopy: Examines the upper digestive tract, including the oesophagus, stomach and first part of the small intestine. The scope enters through the mouth.

• Combined endoscopy: Some children having an initial IBD assessment undergo both procedures during the same session, depending on the clinical circumstances.

Looking at different parts of the digestive tract can help doctors understand the pattern of inflammation and determine which type of IBD is most likely.

🥣 How does a child prepare for a colonoscopy?

Before a colonoscopy, the bowel needs to be emptied so the doctor can see the intestinal lining clearly.

Your child's hospital will provide specific preparation instructions. These may include dietary changes, prescribed laxatives and instructions about when to stop eating and drinking.

Preparation may involve:

• Following a low-fibre or low-residue diet for a specified period.

• Taking a prescribed bowel-cleansing medicine.

• Drinking permitted fluids to help maintain hydration.

• Staying close to a toilet because the preparation causes frequent bowel movements.

• Following fasting instructions before sedation or anaesthesia.

The preparation can be one of the hardest parts for children, as it may cause bloating, cramping, nausea and repeated trips to the toilet.

Follow the instructions provided by your child's hospital rather than using a general schedule. If your child cannot tolerate the preparation, vomits repeatedly or develops severe abdominal pain, contact the medical team for advice.

If your child has a restricted diet, nutritional concerns or significant IBD symptoms, let the team know before preparation begins.

😴 Will my child be asleep during a colonoscopy?

Children commonly receive sedation or general anaesthesia for a colonoscopy, depending on their age, medical needs and the hospital's approach.

The purpose is to help your child remain comfortable and prevent them from experiencing the procedure in the usual awake way.

The anaesthesia or sedation team will explain what is planned, how your child will be monitored and what to expect as they wake up.

You may be able to stay with your child while they are getting ready, but arrangements vary between hospitals. Ask the team when you can be with your child and when you will see them afterwards.

If your child is worried about needles, hospitals or being separated from you, let the team know beforehand. They may be able to offer extra reassurance or support.

🏥 What happens during the procedure?

Although the exact process varies, a colonoscopy usually follows several steps.

1. Checking in

The team checks your child's details, medical history, allergies, medications and preparation instructions. They will also confirm that the required fasting instructions have been followed.

2. Preparing for the procedure

Your child changes into hospital clothing and meets the healthcare professionals involved in their care. The team explains the procedure and answers any remaining questions.

3. Giving sedation or anaesthesia

Your child receives the planned medication and is monitored throughout the procedure.

4. Examining the bowel

The doctor gently passes the colonoscope through the anus and into the large intestine. The camera displays images of the bowel lining on a screen.

The doctor looks for inflammation, ulcers, bleeding and other changes. They may also examine the end of the small intestine.

5. Taking biopsies

Small tissue samples may be taken from different areas of the bowel, even when the lining looks relatively normal. These samples help the laboratory identify microscopic changes.

Taking a biopsy generally does not cause pain in the way a skin cut might, because the intestinal lining does not sense cutting in the same way as skin.

6. Recovery

When the examination is complete, your child is taken to a recovery area. The team monitors them as they wake up or recover from the medication.

The colonoscopy itself may be relatively short, but the overall hospital visit can take several hours because of preparation, waiting and recovery.

🔬 What are biopsies, and why are they important?

A biopsy is a tiny sample of tissue taken from the bowel lining during the colonoscopy.

The samples are examined by a pathologist, who looks for microscopic signs of inflammation and other changes.

Biopsies can help doctors:

• Identify patterns of inflammation associated with Crohn's disease or ulcerative colitis.

• Assess the severity and distribution of inflammation.

• Look for changes that may not be obvious from the camera images alone.

• Investigate other possible causes of symptoms.

Biopsies are often taken from several areas of the bowel, including areas that look normal.

The samples are very small, and your child will not usually feel them being taken during the procedure because of the sedation or anaesthesia.

📋 What can a colonoscopy show?

A colonoscopy can provide valuable information about your child's bowel health.

The doctor may see:

• Redness or swelling of the bowel lining.

• Ulcers or areas of irritation.

• Bleeding or fragile tissue.

• Changes in the pattern or extent of inflammation.

• Areas where the bowel lining appears to have healed.

The findings help the gastroenterologist assess the appearance of the bowel and compare it with previous examinations.

However, a colonoscopy does not provide every piece of information about IBD. Crohn's disease can affect areas of the digestive tract that a colonoscope cannot reach, and additional tests or imaging may sometimes be needed.

📊 What if the colonoscopy looks normal?

A normal-looking colonoscopy can be reassuring, but the doctor may still need to review the biopsy results.

Microscopic inflammation can sometimes be present even when the bowel lining looks normal during the procedure.

In addition, a colonoscopy only examines the areas reached by the scope. If your child's symptoms continue despite normal findings, the healthcare team may investigate other possible causes or examine other parts of the digestive tract.

The results should always be interpreted alongside your child's symptoms, blood tests, stool tests and medical history.

⏳ How long does it take to get the results?

You may receive an initial explanation of what the doctor saw shortly after the procedure, once your child is awake enough for the team to speak with you.

However, biopsy results usually take longer because the samples must be processed and examined in a laboratory.

The waiting time varies between healthcare services. Ask your child's team when the results are expected and how you will receive them.

The gastroenterologist will explain what the findings mean and whether they affect your child's treatment plan.

Try not to draw conclusions from the initial appearance alone. The biopsy results and other investigations may provide important additional information.

💛 Will my child feel pain afterwards?

Most children recover without significant problems, although they may experience some temporary discomfort.

Possible effects include:

• Bloating or wind caused by air introduced into the bowel during the procedure.

• Mild abdominal cramping.

• Sleepiness or tiredness after sedation or anaesthesia.

• A small amount of blood following biopsies in some cases.

Your child may need to rest for the remainder of the day. Follow the hospital's instructions about eating, drinking, medication, activity and supervision after the procedure.

Contact the hospital or seek urgent medical advice if your child develops severe or worsening abdominal pain, a swollen abdomen with significant pain, heavy or persistent bleeding, repeated vomiting, fever or signs of serious illness.

Serious complications are uncommon, but they can occur. If your child appears seriously unwell, seek emergency medical care.

🧒 How can you help your child feel less worried?

Even if your child has had medical procedures before, a colonoscopy can feel daunting.

You can help by explaining what will happen in an age-appropriate way, giving them time to ask questions and acknowledging that feeling nervous is normal.

Consider bringing a favourite comfort item, book or device if the hospital allows it. Let your child know who will be with them and explain that the medical team will look after them throughout the procedure.

For teenagers, privacy, dignity and being included in discussions may be especially important. Encourage them to ask the doctor questions directly if they feel comfortable doing so.

If your child has previously had a difficult experience with medical care, tell the team before the procedure so they can plan appropriate support.

❓ Questions parents often ask

Is a colonoscopy safe for children?

Colonoscopy is commonly performed in children when medically indicated. As with any procedure involving sedation or anaesthesia, there are risks, including bleeding, reactions to medication and, rarely, injury to the bowel. Your child's team can explain the risks relevant to their situation.

Can my child eat after a colonoscopy?

Many children can gradually return to drinking and eating after recovery, but the timing depends on the procedure, sedation and hospital instructions. Follow the discharge advice you receive.

Will my child need another colonoscopy?

Possibly. Some children need further colonoscopies to assess treatment response, investigate symptoms or monitor their disease over time. The timing depends on their individual circumstances and clinical needs.

Does needing a colonoscopy mean my child's IBD is getting worse?

No. Colonoscopies are used for several reasons, including diagnosis, routine assessment and checking whether treatment is working. The fact that one is planned does not automatically mean the disease has worsened.

Can blood or stool tests replace a colonoscopy?

Blood and stool tests are valuable for monitoring IBD, but they cannot always provide the same information as directly examining the bowel and taking biopsies. Your child's healthcare team will recommend the tests needed for their situation.

❤️ The takeaway

A colonoscopy is an important tool for diagnosing and monitoring Crohn's disease and ulcerative colitis in children. It allows doctors to examine the bowel lining, take biopsies and gather information that helps guide treatment.

It is normal to feel worried when your child needs a procedure. Understanding why it is being done, what preparation involves and what happens afterwards can help you support your child with greater confidence.

If you have questions or concerns, speak with your child's gastroenterologist or endoscopy team. They can explain what to expect and help you prepare for your child's individual needs.