How should I prepare?

You'll meet with your doctor to learn about the test and how to prepare. Here are some tips:

  • Tell your doctor about your allergies. Your doctor especially needs to know if you have asthma or are allergic to any foods or medications. If you've had a bad reaction to contrast in the past, you may need to take medication the day before the scan.
  • Tell your doctor all the medications you take, including herbs and over-the-counter drugs.
    • You may be prescribed medication to take a few days before your procedure.
    • If your CT scan will use contrast and you take metformin (Glucophage), you'll need to stop taking it the day of the procedure and wait to restart it until at least 2 days after. (You'll need blood tests before starting it again.) Monitor your blood glucose during this time, and call your doctor if it's higher than 300 mg/dL.
  • If directed, avoid food and drink before the test. If contrast will be used in your CT scan, do not eat or drink anything for 2 hours before the scan.
  • Wear comfortable clothes. If your clothes have metal in them, you'll need to put on a gown.
  • Tell your doctor and the CT technician if you are pregnant or you may be pregnant.
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