What are steps of computed tomography?

Easy test: You will need to lie still on the ct scanner table for about 5 minutes. If the ct scan is order with contrast injection into a vein, then you need to be fasting for 4 hours before the injection and a IV line will be placed temporarily into your arm during the test. If you are having a ct scan of the abdomen, you may need to drink oral contrast to help look at the intestines before the scan.