Fecal occult blood tests

Fecal occult blood tests is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

Fecal occult blood tests (FOBT), stool

Negative

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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.

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