The Harvard Medical School Family Health Guide
Diagnostic Tests - Flexible Sigmoidoscopy
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How do I prepare for the test?
  • Your doctor might ask you to limit your dinner on the night before the test to clear liquids such as juice or broth. On the day of the procedure, you are given one or two enemas 30-60 minutes before the test to empty your bowels, enabling the doctor to get a clear look at your large intestine. If you suffer from constipation, your doctor might also ask you to use a laxative the night before the test. Try to avoid taking NSAIDs or blood thinners for several days before this test to reduce the risk of bleeding if any tissue needs to be biopsied. If you are on medications for diabetes, ask your doctor about ways to avoid hypoglycemia.


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