Colonoscopy For IBD: Preparation, Procedure and Results

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Colonoscopy is an important test used to diagnose and monitor IBD. It allows doctors to examine the inner lining of the large intestine and the end of the small intestine for signs of inflammation, ulcers, bleeding, or other changes. During the procedure, small tissue samples may also be taken for a biopsy.

Why Colonoscopy Is Used In IBD

Colonoscopy helps doctors look directly at the bowel lining to check for inflammation and other changes linked with IBD. It can help:

• Confirm whether inflammation is present.
• Identify areas affected by Crohn’s disease or Ulcerative colitis.
• Assess how severe the inflammation is.
• Help distinguish IBD from other diseases with similar symptoms.
• Monitor how the disease is responding to the treatment. 
• Check for complications in the digestive tract.
• Take a biopsy to examine the tissue under a microscope. 

How To Prepare: Follow The Clinic Plan

Good preparation helps the doctor get a clear view of the bowel lining. Your doctor may give you specific instructions, but preparation usually includes:

• Follow the bowel preparation instructions given by your doctor.
• Wear loose clothes on the test day. 
• Take the bowel cleansing medicine at the recommended time and dose.
• Follow the advised diet and clear liquid instructions.
• Stop eating and drinking at the time your doctor tells you.
• Tell your doctor before if you are taking any blood clot prevention medicines.
• Tell before if you have any reactions or allergies.
• Take your friend or relative with you if your doctor advises you to take a sedative.

What Happens During The Procedure

During a colonoscopy, you will usually lie on your left side while the doctor gently passes a thin camera through the rectum to examine the colon. You may be given a sedative using Entonox or an injection of painkillers to help you relax and stay comfortable. The doctor looks for signs of inflammation, ulcers, bleeding, or other changes of IBD. A small tissue sample may also be taken for a biopsy. After the procedure, some people have mild bloating or abdominal discomfort for a short time. The colonoscopy procedure includes:

Bowel Preparation

Bowel preparation is the process of cleansing stool from the colon before a colonoscopy. You are usually given a Laxative to empty the bowel, along with instructions about what to eat and drink before the procedure. Follow the doctor’s instructions carefully, as an incomplete bowel preparation makes it harder to see the bowel lining clearly.

Sedation

Sedation is basically a medical drug used during a colonoscopy or biopsy to calm and relax you. It can make you sleepy and may reduce awareness of the procedure. If you receive sedition, it is advised to take someone with you to drive you back home safely because you may feel dizzy for a while. You must follow the instructions given by your doctor after taking a sedative.

Why Biopsies Are Taken

Biopsy

A biopsy is a procedure that examines the cells, tissue, or fluid samples under a microscope. It helps detect infections, ulcers, inflammation, and cancer present in the samples. It helps track the progress of medical therapy. In this process, a thin needle is used to extract cells or tissue samples, and then the samples are sent for analysis.

Why Are Biopsies Taken?

Biopsies are taken during a colonoscopy to examine small pieces of bowel tissue under a microscope. They can help doctors look for signs of inflammation, confirm the pattern of IBD, assess changes in the bowel lining, and rule out other conditions that may cause similar symptoms. Colon biopsy helps diagnose diarrhoea and different forms of colitis. IBD is a long- standing disease which increases the risk of colorectal cancer, and routine surveillance with biopsies helps find early dysplasia (precancerous changes). 

Possible Findings

A colonoscopy may show different changes depending on the type and activity of IBD. Possible findings include: 

• Redness and swelling in the bowel lining
• Ulcers or sores in the bowel
• Bleeding from the lining
• Loss of blood vessels
• Patchy areas of inflammation
• Narrowed areas or strictures
• Continuous inflammation, spreading from the rectum upward into the colon
• Normal-looking bowel, especially when IBD is in remission.

Aftercare And Common Temporary Effects

After a colonoscopy, you can return to your daily activities as advised by your doctors. If sedition was used, you may feel sleepy for a while, so you should avoid driving until its effects have worn off. Mild bloating, gas, abdominal discomfort, and other changes in bowel movements can happen for a short time after the procedure. Drink fluids and eat as advised by your doctor. Contact your doctor if you develop severe abdominal cramps, heavy bleeding, fever, vomiting, or other symptoms that concern you. 

Risks And Warning Signs

Colonoscopy is generally safe, but some people may develop: 

• Mild bloating, gas, or abdominal discomfort.
• A small amount of bleeding, especially after biopsy.
• Fever or vomiting 
• Breathing changes or low blood pressure
• Dizziness, weakness, or fainting  
• Rarely, a tear or infection in the bowel. 

Get immediate medical care if you notice: 

• Severe belly pain 
• Heavy bleeding 
• High fever
• Repeated digestive distress
• Extreme weakness 

How Results Guide Treatment And Surveillance

Colonoscopy and biopsy results help doctors understand how active the IBD is and how much of the bowel is affected. If inflammation has improved or the bowel lining has healed, it may suggest that the treatment is working. If inflammation continues, the doctor may consider changing the treatment or monitoring more closely. The test results also help plan future colonoscopy or biopsy. Surveillance is clearly based on the person’s condition and risk factors. Results usually take one to four weeks, depending on the tissue sample.

Disease Extent

Colonoscopy helps doctors see where inflammation is present and how much of the bowel is affected. In ulcerative colitis, inflammation usually starts in the rectum and may extend continuously through part of the colon; in crohn’s disease, affected areas can be patchy and may involve different parts of the digestive tract. Knowing the extent helps doctors assess the disease and plan further treatment. 

Cancer Surveillance

Cancer surveillance is the follow-up exam used to monitor individuals with high risk of colorectal cancer or those who have already been treated for it. People with long-standing IBD, when the colon is affected, may need regular colonoscopies to check for precancerous changes or colorectal cancer. During surveillance, doctors carefully examine the bowel lining and may take a biopsy from suspicious or selected areas. The timing depends on factors such as disease duration, extent of chronic involvement, inflammation, and other risk factors. 

Reference 

The Role of Colonoscopy in Inflammatory Bowel Disease - PMC

Endoscopic Diagnosis and Differentiation of Inflammatory Bowel Disease - PMC

The Role of Colonoscopy in Inflammatory Bowel Disease - PMC

Colonoscopy plus biopsy in the inflammatory bowel diseases - PubMed

How disease extent can be included in the endoscopic activity index of ulcerative colitis: the panMayo score, a promising scoring system - PMC