CT (Computed Tomography) Scan
Medically reviewed by Drugs.com. Last updated on Apr 6, 2025.
AMBULATORY CARE:
A computed tomography (CT) scan
uses x-rays to take pictures of your blood vessels, tissues, bones, or organs. It is also called a computerized axial tomography (CAT) scan.
How to prepare for a CT scan:
- Your healthcare provider will tell you how to prepare. You may be told not to eat or drink anything for 2 to 4 hours before your scan.
- Tell your provider about all your allergies. Contrast liquid may be used to help a body part show up better. Tell your provider if you have ever had an allergic reaction to contrast liquid.
- Tell your provider about all your current medicines. Your provider will tell you if you need to stop any medicine for the scan, and when to stop. Your provider will tell you which medicines to take or not take on the day of your scan.
- Tell your provider if you know or think you are pregnant. A CT scan may harm an unborn baby.
What will happen during a CT scan:
Your healthcare provider will ask you to lie on your back on a table. Medicine may be used to help you feel calm and relaxed. Contrast liquid may be given. The table will be moved into an open space in the middle of the machine. You will need to lie still during the CT scan. The scan may take 5 to 45 minutes, depending on the type of scan you need.
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Treatment options
The following list of medications are related to or used in the treatment of this condition.
What will happen after the CT scan:
Your healthcare provider will tell you how to get the results of your scan.
Risks of a CT scan:
The radiation from a CT scan may increase your risk for cancer.
Call your local emergency number (911 in the US) if:
- You have any signs of an allergic reaction to contrast liquid, such as trouble breathing, mouth or face swelling, or fainting.
Seek care immediately if:
- You are dizzy or feel faint.
- You have nausea or are vomiting.
- You are suddenly urinating less than usual.
Call your doctor if:
- You have questions or concerns about your condition or care.
Drink liquids as directed:
Liquids will help flush the contrast liquid out of your body. Ask how much liquid to drink after your CT scan, and which liquids to drink.
Follow up with your doctor as directed:
Write down your questions so you remember to ask them during your visits.
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The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.
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