Barium Enema

A Barium Enema (also called a Lower GI Series) is a special X-ray examination used to visualize the large intestine (colon) and rectum. It helps detect problems such as inflammation, narrowing, diverticula, or tumors in the bowel.

During the test, a contrast material called barium sulfate is gently introduced into the colon through the rectum. The barium coats the lining of the bowel, allowing clear X-ray images to be taken.

Why is a Barium Enema done?

Your doctor may request a Barium Enema to investigate:

• Persistent abdominal pain or changes in bowel habits
• Chronic constipation or diarrhea
• Blood or mucus in stool
• Unexplained weight loss or fatigue
• Suspected colon cancer, polyps, or tumors
• Inflammatory bowel diseases (e.g., ulcerative colitis)
• Diverticulosis (small pouches in the bowel wall)
• Structural problems such as narrowing or twisting of the colon

It is especially useful in places where advanced imaging like CT Colonoscopy is not readily available.

How should I prepare for a Barium Enema?

Proper preparation is very important for a clear and accurate test.

Here’s what to expect:

• Bowel cleansing: You’ll be given special instructions to empty your bowel before the test. This may include taking a mild laxative or using an enema kit the day before.
• Diet: You’ll be asked to eat only light or clear foods the day before (pap, tea, clear fluids) and avoid solid meals.
• Fasting: Do not eat or drink anything after midnight before your appointment, unless told otherwise.
• Medication: Continue your regular medicines unless your doctor advises otherwise.
• Remove metal: Remove all metal objects or jewelry from your abdomen and lower body before the procedure.

What happens during a Barium Enema procedure?

• You’ll lie on your side on the X-ray table, and a lubricated tube will be gently inserted into your rectum.
• Barium liquid is slowly introduced through the tube to fill your large intestine. You may feel a sensation of fullness or an urge to pass stool- this is normal.
• Sometimes, air may also be introduced (in a double-contrast study) to expand the bowel and improve image detail.
• The radiologist or radiographer will take a series of X-ray images from different angles as the barium outlines your colon.
• You may be asked to change positions several times during the scan to ensure complete coverage.
• Once the imaging is done, the tube will be removed, and you’ll be allowed to use the toilet to expel the barium.
• The entire procedure usually takes 30–45 minutes.

Is a Barium Enema painful?

No, the test is not painful, but it may feel uncomfortable. You might experience:

• Mild cramping or bloating
• A temporary urge to open your bowels
• A feeling of fullness as the barium and air are introduced

These sensations pass quickly once the procedure is completed.

Are there any risks or side effects?

A Barium Enema is very safe when performed correctly.

However, some minor side effects may occur:

• Temporary constipation
• Pale or whitish stools for 1–3 days (as your body clears the barium)
• Mild bloating or abdominal discomfort

Perforation, barium leakage, severe impaction, and contrast reactions are uncommon but important. Suspected perforation or acute severe colitis changes whether and how the examination is performed, and water-soluble contrast may be chosen instead of barium.

To prevent constipation, drink plenty of fluids after the procedure unless advised otherwise.

Can I eat or drink after the test?

Yes, you can resume your normal diet and activities after the test.

It’s important to drink lots of water to help flush the barium out of your system and prevent constipation.

When will I get my results?

The X-ray images will be reviewed by a Radiologist, who will prepare a detailed report for your doctor.

Results are typically available within 24–48 hours, depending on the facility.

Can children have a Barium Enema?

Yes. A Barium Enema can be safely performed in children when necessary. The procedure is adjusted to ensure the child’s comfort and uses smaller quantities of barium.

Can I have a Barium Enema if I am pregnant?

What is the difference between a Barium Enema and a CT Colonoscopy?

Both tests visualize the large intestine, but they use different techniques:

• Barium Enema uses X-rays and barium contrast to show the outline of the colon.
• CT Colonoscopy (Virtual Colonoscopy) uses a CT scanner to create detailed 3D images of the colon and surrounding structures.

CT Colonoscopy provides more information and is less invasive, but Barium Enema remains a useful and affordable option in many settings.

What are the important limitations and safety checks?

Fluoroscopy shows movement or anatomy during a specific examination, but it does not guarantee a diagnosis or exclude every abnormality. Image quality and interpretation can be limited by positioning, movement, body size, retained contrast, overlying structures, incomplete filling, or the patient's ability to complete the study. Further endoscopy, ultrasound, CT, MRI, laboratory testing, or tissue sampling may still be needed.

Fluoroscopy uses ionising radiation. Dose varies with the body area, examination complexity, equipment, patient size, and imaging time; the team should use the lowest exposure that still answers the clinical question. Tell the team before the examination if you are or may be pregnant. Pregnancy does not create a universal ban: the referrer and imaging team should decide whether to defer, modify, or proceed when the expected benefit outweighs the risk.

Contrast and preparation are procedure-specific. Barium, water-soluble iodinated contrast, intravenous contrast, and contrast placed into a joint, bladder, uterus, duct, or fistula have different risks. Tell the team about prior reactions, swallowing or aspiration problems, suspected perforation, kidney or thyroid disease, diabetes, medicines, and recent contrast studies. Do not fast, stop medicines, interrupt breastfeeding, or take bowel preparation or antibiotics based only on a general webpage; follow the center's written instructions.

Questions to ask the fluoroscopy team

• What exact question should this examination answer, and is a radiation-free or non-invasive alternative suitable?
• Which contrast route and agent will be used, and what preparation, pregnancy, breastfeeding, allergy, kidney, diabetes, or medicine instructions apply to me?
• Will a catheter, internal examination, sedation, or pain relief be needed, and may I stop the procedure if I am uncomfortable?
• What symptoms require urgent help afterward, when will the signed report be ready, and who will explain the result?

Sources and further reading

• RadiologyInfo.org: Fluoroscopy
• American College of Radiology: Manual on Contrast Media
• RadiologyInfo.org: Radiation safety for children

Conclusion

A Barium Enema is a reliable and effective procedure for evaluating the large intestine, especially in cases of bowel symptoms or unexplained abdominal issues.

Proper preparation, following instructions, and communicating openly with your radiographer help ensure accurate and comfortable results.

Want to learn more?

There are other barium studies that look at the upper parts of the digestive system. Check out Barium Swallow, Barium Meal, and Barium Follow-Through to learn more about them.