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Harvard Medical School
You will need to sign a consent form giving your doctor permission to perform this test. Tell your doctor if you have ever had an allergic reaction to lidocaine or the numbing medicine used at the dentist's office.
Your doctor will order blood tests to find out if you are at extra risk for bleeding after the procedure. If you take aspirin, nonsteroidal anti-inflammatory drugs, vitamin E or other medicines that affect blood clotting, talk with your doctor. It may be necessary to stop or adjust the dose of these medicines before your test. If you have diabetes and take insulin, discuss this with your doctor before the test.
You will be told not to eat or drink anything after midnight the night before the test. This is a safety precaution in case you are one of the rare patients who has a complication that might require surgery on the same day as the procedure. You should continue to take your medicines with sips of water even though you are not eating a meal, however. This is particularly important for blood pressure medicines-if your blood pressure is too high on the day of the test, your doctor will probably not do the procedure.
You should plan on spending one night in the hospital after this test so that you can be monitored for complications such as bleeding.