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 tumours and abscesses.

How can you prepare for the test?

Talk to your doctor about all your health conditions before the test. For example, tell your doctor if:

• You are or might be pregnant.
• You are allergic to any medicines.
• You have diabetes.
• You take metformin.
• You are breastfeeding.
• You get nervous in confined spaces. You may need medicine to help you relax.
• You have had an X-ray test using barium contrast material in the past 4 days.

You may be asked to not eat any solid foods starting the night before your scan.

What happens during the test?

• 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 else should you know about the test?

• A CT scan does not hurt.
• If a 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.
• If you breastfeed and are concerned about whether the dye 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 prefer, you can store some of your breast milk ahead of time and use it for a day or two after the test.
• The dose of radiation from a CT scanner may be higher than that from other X-ray tests. If you are concerned about the radiation risk, talk to your doctor.

What happens after the test?

• You will probably be able to go home right away.
• You can go back to your usual activities right away.
• Drink plenty of fluids for 24 hours after the test if dye was used, unless your doctor tells you not to.

When should you call for help?

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