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Fecal occult blood tests (FOBT), stool
Dietary (meat, fish, turnips, horseradish) and medication (aspirin, nonsteroidal anti-inflammatory drugs) restrictions are often recommended to reduce false positive results, but available evidence does not suggest large effect on positivity rates in non-rehydrated testing.
To avoid false-negatives, patients should avoid taking vitamin C.
Patient collects two specimens from three consecutive bowel movements.