A barium enema is an X-ray exam of the large intestine (colon and rectum). It may also be called a lower gastrointestinal (GI) exam. The test is used to help find diseases
and other problems that affect the large intestine. The colon is filled with a contrast material that contains barium so that the intestine can be seen on an X-ray. This is done by
pouring the contrast material through a tube inserted into the anus. The barium
blocks X-rays. This causes the barium-filled colon to show up clearly on the X-ray
There are two types of barium enemas.
In a single-contrast study, the colon is filled with
barium. This outlines the intestine and shows large
In a double-contrast or air-contrast study, the colon is first filled with
barium, and then the barium is drained out. This leaves only a thin layer of barium
on the wall of the colon. The colon is then filled with air. This provides a
detailed view of the inner surface of the colon. It makes it easier to see
narrowed areas (strictures), diverticula, and swelling.
The single-contrast study may be the better choice for certain medical reasons. It may also be a good choice for older people who may not be able to
tolerate a double-contrast study, which takes longer and is more uncomfortable. If the results are not clear, then a double-contrast study may also be
Before a barium enema, you must prepare your large intestine so that it is very clean. The colon must be completely
clear of stool and gas. Even a small amount of stool can affect the results of
You should drink very large amounts of
noncarbonated clear liquids, unless your doctor has advised you not
You will then take laxatives to empty your
You may be asked to take a tap water enema to clean any remaining stool from your
On the day of the test, you may need to repeat
the enema until the liquid that passes is free of any stool.
Sometimes a rectal suppository or a store-bought enema,
such as a Fleet enema, is used instead of a tap water enema.
Talk to your doctor about any concerns you have regarding
the need for this test. Ask about its risks, how it will be done, and what the results
will mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).
How It Is Done
During the test
The colon is filled with a contrast material that contains barium so that the colon can be seen on an X-ray.
This is done by pouring the contrast material through a tube inserted into the anus. The barium blocks X-rays, causing the
barium-filled colon to show up clearly on the X-ray picture.
You will lie on the X-ray table while the first X-ray film is taken.
While you are lying on your side, a well-lubricated enema tube will be inserted gently into
your rectum. The barium contrast material is then allowed to flow slowly into
A small balloon on the enema tip may be filled with air to
help you hold in the barium. Tightening your anal sphincter muscle (as if you
were trying to hold back a bowel movement) against the tube may help. Taking slow,
deep breaths may also help.
You may be given a shot of medicine to relieve the cramping.
Your doctor will watch the flow of the barium through
your colon on an X-ray fluoroscope monitor that is like a TV
You will be asked to turn to different
positions (sides, front, and
back). The table may be tilted slightly to help the barium flow through
your colon and to take X-rays from different directions.
Your doctor may also press gently on your belly with his
or her hand or a plastic paddle. This can help move the barium through your
If a double-contrast study is being done, the barium
will be drained out and your colon will be filled with air.
A single-contrast study usually takes 30 to 45 minutes. But the actual time the barium is held inside is only 10 to 15 minutes. A
double- or air-contrast study may take up to an hour.
After the test
When the test is finished:
The enema tube is removed.
You will be given a bedpan or be taken to the toilet to get rid of
as much of the barium as you can.
One or two more X-ray
pictures (post-evacuation films) will then be taken.
test, you may go back to your regular diet unless your doctor gives you other instructions. Be sure to
drink plenty of liquids. They replace those you have lost, and they help flush the
remaining barium out of your system. Your bowel movements may look white or
pinkish for 1 to 2 days after the test. Your doctor may tell you to take a medicine, such as a
laxative, to help you pass the rest of the barium.
How It Feels
A barium enema can be
uncomfortable and tiring. But it usually doesn’t last very long.
Many people report that the preparation and bowel cleaning are the hardest parts. The laxative may not taste good, and the
frequent bowel movements can be tiring. Also, the anal area can become quite
sore during the process. Warm sitz baths or a local anesthetic salve, such as
Preparation H, can help ease this discomfort.
You may be
embarrassed by the test. You may worry that you won’t be able to hold the
barium and that it will leak onto you or onto the table. The doctors who
perform this procedure are used to this. They will be able to help
The X-ray table is hard and sometimes cold because
air-conditioning is used to keep the equipment cool. When the barium first
flows into your colon, it may feel a bit cool. As your colon fills, you may
have a feeling of fullness, moderate cramping, and a strong urge to have a
bowel movement. If an air-contrast study is performed, you may feel more
cramping or gas pains from having gas pumped into your large intestine. Taking
slow, deep breaths through your mouth can help you relax.
The test may take awhile. You may want to bring something to do quietly (like bringing a book or magazine to read).
feel tired for a day or so after the test. Make sure to arrange for someone to
drive you home after the test. This test can be exhausting.
There is very little chance of a problem from
having a barium enema.
Sometimes the barium that remains in the colon hardens. This can cause severe constipation (impaction) or obstruction. To decrease your risk, drink extra fluids after the test. If
your doctor recommends it, use an enema or mild
laxative after the test.
In rare cases,
barium can cause swollen areas in the colon. These are called barium
Perforation of the bowel is a more serious, but very
rare, complication. Under the pressure from the barium or air, a weakened
section of the colon may break open. This allows the contents of the intestine to spill
into the abdominal cavity. It may occur in people whose bowel wall has been
weakened by intestinal problems, such as inflammatory bowel diseases (ulcerative colitis or Crohn’s disease).
Call your doctor right away if you:
Have rectal bleeding.
Get a fever.
Do not have a bowel
movement within several days after the test.
If your doctor thinks you have an abdominal mass, other tests
may be needed before or after a barium enema. These include abdominal X-rays, ultrasound studies, and CT scans.
upper gastrointestinal series is planned, it should be done after the
barium enema. The barium swallowed during an upper GI series may take several
days to pass through the intestine. This can interfere with the results of a
In most cases, a barium enema is not used to screen for colon cancer. Other tests are used instead.