​A CT scan uses x-rays to make detailed pictures of the structures inside your body. During the test, you’ll li​e on a table that​’s attached to a d​​onut-shaped machine, called a CT scanner. You may get contrast dye injected into a vein or in a drink that you swallow. This helps to show parts of your body more clearly.

Learn more about general CT scans or choose a specific test from the list below:

How to get ready for your CT scan

Instructions may vary depending on the type of CT scan you're having. The instructions below explain how to get ready for your CT scan so it can be done safely and correctly.

Biopsy patient instructions explain what to do if a small piece of tissue will be taken for testing. Enhanced patient instructions tell you how to prepare for a CT scan that uses a special dye called contrast to make the pictures clearer. Non-enhanced patient instructions​ tell you how to get ready for a CT scan done without this dye.

Follow the instructions for your specific CT scan carefully. If you have questions about the information on how to get ready for your test, call the imaging department where you are having your test.

Your health, safety, and imaging tests

Some imaging tests use radiation and a contrast dye. Tests that use imaging to guide a procedure may also use medicine to numb an area or help you or your child relax or sleep. Your imaging team will watch you closely to keep you safe. If you have questions about safety, the test, or your health ask the imaging staff or your healthcare provider.

For more information on imaging tests and your health and safety, choose a link below:

• Checking your blood glucose (sugar) level when you’re in the hospital
• Continuous glucose monitors and imaging tests
• Learning about radiation exposure
• Pregnancy: Chemicals, cosmetics, and radiation
• Radiation exposure: Risks and health effects
• Sedation for a medical procedure: Care instructions​