Computed Tomography (CT) |  | 
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Computed tomography (CT) is a test that combines X-rays and computer scans. The result is a detailed picture that can show problems with soft tissues (such as the lining of your sinuses), organs (such as your kidneys or lungs) and bones.
Before the test
- Be sure to mention the medications you take and ask if it is okay to take them before the test
- If instructed, stop eating and drinking 8 hours before your CT
- If instructed, drink contrast (a liquid that improves the image) 8 hours before your CT
- The test may take 10 minutes to 2 hours, depending on whether contrast is used and the part of the body being scanned
- Arrive on time to check in
- When you arrive, you may be asked to change into a hospital gown
During the test
- You may be given contrast through an intravenous (IV) line or by injection
- You will lie on a table. The table slides into the CT scanner
- The technologist will ask you to hold your breath for a few seconds during your scan
After the test
- You can go back to your normal diet and activities right away. Any contrast will pass naturally through your body within a day
- Before leaving, you may need to wait briefly while your images are being reviewed. Your doctor will discuss the test results with you during a follow-up appointment or over the phone
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Tell the technologist if:
- You have allergies or kidney problems
- You take diabetes medication
- You are pregnant or think you may be
- You ate or drank anything before the test
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