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Harvard Medical School
You'll undergo a breast exam and possibly a mammogram before the biopsy to determine where the lump is located. If you are having a sedative with local anesthesia, or if you are having general anesthesia, you'll be asked not to eat anything after midnight on the day before the surgery.
Tell your doctor if you're taking insulin, NSAIDs, or any medicine that can affect blood clotting. You might have to stop or adjust the dose of these medicines before your test.