- All of the steps that need to be taken by an individual patient before her colonoscopy should be provided in writing by the doctor or examiner, according to the National Digestive Diseases Information Clearinghouse (NDDIC).
- Preparations for a colonoscopy may begin between one and three days before the tests is performed, according to the NDDIC and Medline Plus.
- No solids should be eaten once preparation for a colonoscopy has begun. According to the NDDIC and Medline Plus, acceptable liquids include: bouillon or broth with no fat, strained juice, water, plain coffee and tea, sports drinks and gelatin.
- Laxatives and enemas should only be used as directed by a doctor in order to clear the bowel before a colonoscopy, according to the NDDIC.
- Patients taking preparations with iron will be asked to stop taking these several weeks before the test, and medications that thin the blood should not be taken for several days beforehand, according to Medline Plus.
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