CT Scan of the Abdomen: About This Test

What is it?

A CT (computed tomography) scan uses X-rays to make detailed pictures of your body and structures inside your body. A CT scan of the abdomen (belly) can give your doctor information about your liver, pancreas, kidneys, and other structures in your belly.

During the test, you will lie on a table that is attached to the CT scanner. The CT scanner is a large doughnut-shaped machine.

Why is this test done?

A CT scan of the belly can help find problems such as kidney stones, infected pouches in the colon (diverticulitis), and appendicitis. It also helps find tumors and abscesses.

How do you prepare for the test?

In general, there's nothing you have to do before this test, unless your doctor tells you to.

• Tell your doctor if you get nervous in tight spaces. You may get a medicine to help you relax. If you think you'll get this medicine, be sure to arrange a ride home.
• You may be asked to not eat any solid foods starting the night before your scan.

How is the test done?

• You may have contrast material (dye) put into your arm through a tube called an I.V. Or you may drink the contrast material, or it may be put through a tube into your bladder or rectum.
• You will lie on a table that is attached to the CT scanner.
• The table slides into the round opening of the scanner. The table will move during the scan. The scanner moves inside the doughnut-shaped casing around your body.
• You will be asked to hold still during the scan. You may be asked to hold your breath for short periods.
• You may be alone in the scanning room. But a technologist will watch you through a window and talk with you during the test.

How does the test feel?

The test will not cause pain. But some people feel nervous inside the CT scanner.

If a medicine to help you relax (sedative) or dye is used, you may feel a quick sting or pinch when the I.V. is started. The dye may make you feel warm and flushed and give you a metallic taste in your mouth. Some people feel sick to their stomach or get a headache. Tell the technologist or your doctor how you are feeling.

How long does the test take?

The test will take about 30 to 60 minutes. Most of this time is spent getting ready for the scan. The actual test only takes a few minutes.

What are the risks of the test?

The chance of a CT scan causing a problem is small.

• There is a chance of an allergic reaction to the dye (contrast material).
• If you breastfeed and are concerned about whether the contrast material used in this test is safe, talk to your doctor. Most experts believe that very little dye passes into breast milk and even less is passed on to the baby. But if you are concerned, you can stop breastfeeding for up to 24 hours after the test. During this time, you can give your baby breast milk that you stored before the test. Don't use the breast milk you pump in the 24 hours after the test. Throw it out.
• There is a risk of damage to cells or tissue from being exposed to radiation, including the small amounts used in CTs, X-rays, and other medical tests. Over time, exposure to radiation may cause cancer and other health problems. But in most cases, the risk of getting cancer from being exposed to small amounts of radiation is low. It is not a reason to avoid these tests for most people.

What happens after the test?

• You will probably be able to go home right away, depending on the reason for the test.
• You can go back to your usual activities right away.
• If dye was used, drink lots of liquids for 24 hours after the test, unless your doctor says not to.

When should you call for help?

Watch closely for changes in your health, and be sure to contact your doctor if you have any problems.