Barium Enema

Approved by the Cancer.Net Editorial Board, 10/2018

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A barium enema is an x-ray of the colon and rectum. The colon and rectum make up the large intestine, which helps the body process waste. A barium enema helps doctors find health conditions in the colon and rectum, such as inflammation, polyps, and cancer. Barium is a contrast medium. A contrast medium is a substance used to make clearer images of the inside of the body.

Who does my barium enema?

A radiology technician or a radiologist performs a barium enema. It is done in an x-ray room in either a hospital or a doctor's office. The radiologist then reads the results and diagnoses or confirms any abnormalities.

How should I prepare for a barium enema?

When you schedule the barium enema, you will get detailed instructions on how to prepare.

What to eat. Your colon must be completely empty, so eat only soft foods or clear liquids for 1 to 3 days beforehand. This includes fat-free bouillon or broth, black coffee, and strained fruit juice. You will not be allowed to eat or drink anything after midnight on the day of your procedure.

Emptying your colon. You will also need to take a laxative or give yourself an enema the day or night before your appointment. This step removes any remaining waste from your colon. If your doctor prescribes a laxative, it will be either a pill or a powder that you mix with water before drinking. The laxative will make you use the bathroom frequently. Make sure you have easy access to a bathroom during this time.

Topics to discuss. Be prepared to discuss the following topics with your health care team:

  • All medications you are taking

  • Any drug allergies you have, including if you are allergic to barium

  • Whether you should take your usual medications on the day of the procedure

  • Any medical conditions you have and if there is any chance that you are pregnant. X-rays are harmful to a developing baby.

  • Any concerns you may have about the test

Insurance, costs, and consent. Before your appointment, ask your insurance provider what costs will be covered. Find out how much of the cost you will have to pay. Once you arrive at the doctor's office or hospital, you will be asked to sign a consent form. This form states that you understand the benefits and risks of the procedure and that you agree to have it.

During the procedure

How long will it take? A barium enema usually takes 20 to 30 minutes.

What should I wear? You will need to remove all clothing, jewelry, and any other metal objects that could interfere with the x-ray. You will be given a hospital gown to wear.

What will happen during the procedure?

When you are ready, the doctor or technician will direct you to lie on your side on an exam table in a private room. He or she will drape a sheet over your body.

The exam table is attached to an x-ray machine and a video monitor. The x-ray technologist will first take several x-rays to make sure your colon is empty.

The doctor or technician will then insert a well-lubricated enema tip attached to a tube into your anus. And the radiologist will insert barium into your colon through the tube.

The doctor or technician may ask you to move into different positions during the test. This is so the barium can flow through the entire colon.

Once the radiologist determines there is enough barium in the colon, he or she may deliver a small amount of air into the colon through the same tube. This step is called a double contrast barium enema. It inflates the bowel and produces a better view of the intestinal wall. Several x-rays will be taken during this time. When an x-ray is taken, the barium shows up bright white, clearly outlining the colon and rectum.

Is it painful? You may feel mild stomach pressure and cramping when the barium flows through the colon. Taking slow, deep breaths can make you more comfortable. You may also feel discomfort from lying still for a long time. Once the barium is inserted into the colon, you may also feel the urge to have a bowel movement. It is important for you to try to hold in the barium until the test is complete.

After the procedure

How will I know when the procedure is finished? Once the radiologist has taken enough images of the colon, he or she will remove the enema tip. You will be helped down from the table so you can go to the restroom to push out the barium. You will then return to the exam room for another x-ray to make sure you have emptied your bowel enough.

What should I expect after returning home? You may notice gray or white stool for several days after a barium enema. That is the remaining barium leaving your body. To prevent constipation and help remove the remaining barium, drink plenty of fluids for the next several days. Your health care team may also recommend taking a laxative.

Call your doctor’s office immediately if you have:

  • Severe stomach pain

  • Fever

  • Bloody bowel movements

  • Dizziness

  • Weakness

Will I need to stay home after the procedure? You can go back to your usual activities immediately after the barium enema. But you should have someone else drive you home from the test.

Questions to ask your health care team

Before your barium enema, consider asking the following questions:

  • Why are you recommending this procedure?

  • Who will perform the barium enema? Who else will be in the room?

  • What will happen during the test?

  • How long will it take?

  • Will it be painful?

  • Are there risks associated with having a barium enema?

  • Will I need to avoid any activities afterward?

  • How accurate is a barium enema at finding cancer?

  • When and how will I learn the results?

  • Who will explain the results to me?

  • What other tests will I need if the barium enema finds evidence of cancer?

Related Resources

Guide to Colorectal Cancer


More Information X-ray (Radiography) - Lower GI Tract

MedlinePlus: Barium Enema