Certain exams require a special dye, called contrast, to be delivered into the body before the test starts. Contrast helps certain areas show up better on the x-rays.
Contrast can be given in several ways.
- It may be delivered through a vein (IV) in your hand or forearm.
- It may be given as an injection into the space surrounding the spinal cord.
If contrast is used, you may also be asked not to eat or drink anything for 4-6 hours before the test.
Tell your doctor nurse if you have ever had a reaction to contrast. You may need to take medicines before the test in order to safely receive this substance.
Before receiving the contrast, tell your health care provider if you take the diabetes medication metformin (Glucophage).You may need to take extra steps if you take this medicine.
Find out if the CT machine has a weight limit if you weigh more than 300 pounds. Too much weight can cause damage to the scanner.
You will be asked to remove jewelry and wear a hospital gown during the study.