Barium Enema: Purpose, Procedure & Interpreting Your Results

A barium enema, also known as a lower gastrointestinal (GI) series, is a diagnostic imaging procedure that uses a special type of X-ray called fluoroscopy and a contrast material called barium sulfate to create detailed images of the large intestine (colon and rectum). The primary purpose of this test is to detect and diagnose abnormalities within the intestinal wall. During the procedure, the barium, a chalky white liquid, is introduced into the colon via the rectum. This liquid coats the lining of the intestine, making it visible on an X-ray, highlighting its shape, size, and any irregularities.

In many cases, a double-contrast technique is used, where air is also gently introduced to expand the colon and provide even sharper, more detailed images. While newer techniques like colonoscopy are often used as a first-line investigation, the barium enema remains a valuable and important tool in specific clinical situations, such as when a colonoscopy is incomplete or cannot be performed, or to gain a different perspective on the structure and function of the colon.

What is a Barium Enema?

A barium enema is a radiologic examination that allows a doctor, typically a radiologist, to visualize the entire length and lining of your large intestine. The procedure relies on the properties of barium sulfate and X-rays.

• Barium Sulfate: This is a metallic, chalky substance that is mixed with water to create a thick liquid. Barium is a contrast agent, which means it is completely opaque to X-rays. When it fills the colon, it blocks the path of the X-rays, causing the intestine to appear bright white on an imaging screen. This clear outline allows the radiologist to assess the general shape and contour of the colon and identify any large blockages or structural problems.
• Fluoroscopy: Instead of a single static picture, fluoroscopy is like an X-ray movie. It uses a continuous X-ray beam to create a real-time video of the barium flowing through and filling the colon. This allows the radiologist to observe the movement and function of the intestine as it happens.
• Double-Contrast Technique: To achieve the most detailed images, a double-contrast barium enema (DCBE) is often performed. After the initial filling with barium, much of the liquid is drained, leaving a thin, fine coating on the intestinal wall. Air is then gently introduced into the colon through the enema tube. The air expands the colon and makes the barium-coated lining stand out in sharp relief, allowing the radiologist to detect much smaller abnormalities, such as polyps, ulcers, and subtle inflammation.

The entire procedure is designed to provide a comprehensive anatomical map of your large intestine, helping to diagnose a wide range of conditions without the need for sedation or more invasive procedures.

When is a Barium Enema Recommended?

A barium enema is used to investigate a variety of symptoms and to diagnose and monitor several diseases of the colon and rectum. While colonoscopy is often the preferred initial test, a barium enema may be recommended in specific circumstances:

Incomplete Colonoscopy: If a colonoscopy could not be completed (e.g., due to a blockage, a tortuous colon, or patient discomfort), a barium enema can be used to visualize the parts of the colon that were not reached.

When Colonoscopy is Contraindicated: For patients who are at high risk for complications from sedation or for whom a colonoscopy is medically unsafe, a barium enema is a valuable alternative.

Evaluation of Specific Symptoms: To investigate the cause of symptoms such as:

• Chronic diarrhea or constipation.
• Unexplained abdominal pain.
• Blood in the stool (hematochezia).
• A change in bowel habits.
• Unexplained weight loss.

Diagnosing and Monitoring Inflammatory Bowel Disease (IBD): It can help diagnose and assess the extent of conditions like Ulcerative Colitis and Crohn's disease, showing the characteristic patterns of inflammation and ulceration.

Detecting Abnormalities: The test is effective at identifying various structural issues, including:

• Diverticulosis: Small pouches that bulge outward from the colon wall.
• Polyps: Non-cancerous growths that can sometimes develop into cancer.
• Colorectal Cancer: Tumors within the colon or rectum.
• Strictures: Narrowing of a segment of the intestine.
• For Certain Pediatric Conditions: It is used to diagnose conditions in children, such as Hirschsprung's disease or to evaluate the anatomy before or after surgery.

Understanding the Underlying Conditions

A barium enema provides crucial information about a variety of disorders affecting the large intestine.

Inflammatory Bowel Disease (IBD): This is a term for two main conditions characterized by chronic inflammation of the gastrointestinal tract.

• Ulcerative Colitis (UC): This condition causes long-lasting inflammation and ulcers in the innermost lining of the colon and rectum. A barium enema can show the extent of the continuous inflammation and the characteristic lead pipe appearance of a colon that has lost its normal folds.
• Crohn's Disease: This type of IBD can affect any part of the GI tract, from the mouth to the anus. When it affects the colon, a barium enema can reveal skip lesions (areas of inflammation interspersed with healthy tissue), deep ulcers, and strictures.
• Diverticular Disease: This involves the formation of small, bulging pouches (diverticula) in the lining of the digestive system, most often found in the lower part of the large intestine. A barium enema can clearly visualize these pouches.
• Colorectal Polyps and Cancer: Polyps are small clumps of cells that form on the lining of the colon. While most are harmless, some can develop into colorectal cancer over time. A double-contrast barium enema is effective at identifying polyps and larger cancerous masses, which appear as filling defects in the barium outline. It is important to note that if polyps are found, a follow-up colonoscopy is required to remove them (polypectomy) and test them for cancer.

Risk Factors & When to Consider the Test

Your doctor may suggest a barium enema if you are experiencing persistent gastrointestinal symptoms and a detailed look at the structure of your colon is needed. It is a diagnostic step taken after an initial consultation and physical examination. If you have any of the symptoms mentioned above, such as a persistent change in your bowel habits, rectal bleeding, or chronic abdominal pain, it is essential to consult a gastroenterologist for a proper evaluation.

The Barium Enema Procedure: A Detailed Walkthrough

The Bowel Preparation (The Most Critical Step)

For the test to be accurate, your colon must be completely empty of all stool. You will receive very specific instructions from the hospital, which you must follow precisely.

• Dietary Restrictions: You will be on a strict clear liquid diet for at least 24 hours before the procedure. This means no solid food, milk, or dairy products. Clear liquids include water, clear broth, black tea or coffee (no milk), clear fruit juices (like apple or white grape), and gelatin.
• Powerful Laxatives: You will be prescribed a strong laxative to be taken the evening before the test. This is often a large volume of a special solution (like polyethylene glycol) or other laxatives like magnesium citrate, which you will drink over a few hours. This will induce significant diarrhea to clean out the colon.
• Enemas (Optional): In some cases, you may be asked to use an over-the-counter enema kit on the morning of the procedure for a final cleansing.
• Tips for a Successful Prep: Stay close to a bathroom. Drink plenty of clear fluids to stay hydrated. Use disposable wipes and barrier creams to prevent skin irritation.

The Day of the Procedure

The test is performed in the radiology department of the hospital and takes about 30 to 60 minutes.

1. Preparation: You will change into a hospital gown. You will be asked to lie on your side on the X-ray table.
2. Initial X-ray: A preliminary X-ray of your abdomen may be taken to ensure your colon is clean.
3. Enema Tip Insertion: A small, flexible, lubricated tube is gently inserted into your rectum. A small balloon on the tip may be inflated to help keep it in place.
4. Barium Administration: The radiologist will begin to slowly allow the liquid barium solution to flow into your colon through the tube. You may feel some abdominal fullness, cramping, and a strong urge to have a bowel movement. It is very important to try to hold the liquid in by taking slow, deep breaths.
5. Imaging: As the colon fills, the radiologist will watch the flow on a fluoroscopy monitor and will ask you to turn into various positions (onto your back, other side, stomach). This helps the barium coat the entire lining of the colon. Several X-ray images will be taken.
6. Double-Contrast Phase: If a double-contrast study is being done, the barium bag will be lowered to drain much of the liquid. The radiologist will then gently introduce air through the tube to expand the colon. This may cause more cramping and fullness. More X-ray images will be taken in different positions.
7. Completion: Once all the necessary images are captured, the enema tip is removed. You will be escorted to a nearby toilet to expel as much of the barium and air as possible. A final X-ray may be taken after you have evacuated.

After the Procedure: Recovery and Follow-Up

You can generally resume your normal diet and activities immediately after the test unless your doctor advises otherwise.

• Expelling the Barium: You may have some continued cramping as you pass the remaining barium and air.
• Stool Appearance: Your stools will be white or light-colored for a few days until all the barium has been expelled from your body.
• Preventing Constipation: Barium can cause constipation or, rarely, a blockage if it is not cleared. It is very important to drink plenty of extra water and fluids for several days after the test. Your doctor may also recommend taking a mild laxative.
• Follow-Up: The radiologist will analyze the images and send a detailed report to your doctor, who will then discuss the results with you at a follow-up appointment.

Myths vs Facts

Take the Next Step

Understanding the health of your colon is vital to your overall well-being. If you are experiencing persistent digestive symptoms, a barium enema can be an important diagnostic tool to provide your doctor with a clear and detailed picture of your large intestine. While the preparation can be demanding, the information gained from the procedure is invaluable in reaching an accurate diagnosis and formulating an effective treatment plan.

If your doctor has recommended this test, our team of expert radiologists and gastroenterologists is here to ensure your procedure is performed with the utmost care, professionalism, and focus on your comfort.

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