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Harvard Medical School
If you will be receiving contrast dye during your study, it is appropriate for you to have a blood test to check your kidney function before the test. (A test that was done during the past six months may be adequate.) People who are taking the diabetes medication metformin (Glucophage) should discontinue this treatment for several days before a CT scan that includes contrast. If your doctor has special concerns about the health of your kidneys, you may be asked to take a protective medicine named n-acetylcysteine (Mucomyst) before the test.
Tell your doctor if you're allergic to x-ray contrast dyes or if you may be pregnant.