What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- Having a
barium enema within a week before the test. Barium can
block your doctor's view of the colon.
- Not doing a good colon prep before the test. If you still have stool (feces) in the
colon, your doctor may cancel the test and you will have to reschedule and do the colon prep again.
- Having a colon that has many turns, past surgery on the colon, or a lot of pain
during the test.
- Taking iron supplements. This may make your stool
turn black and make it hard to clean out the colon. Do not take iron
supplements for several days before a colonoscopy.
- Drinking red or purple fluids, such as grape juice or fruit
- Eating red or purple foods, such as grape ice pops or
Adam Husney, MD - Family Medicine
Arvydas D. Vanagunas, MD - Gastroenterology
December 7, 2011
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