Fecal Occult Blood Testing – False Results

FALSE POSITIVES ON GUIAC:
Foods (2 days before and day of test)
Red meat
Beets
Broccoli
Cantaloupe
Carrots
Cauliflower
Cucumbers
Grapefruit
Horseradish
Mushrooms
Radishes
Turnips
Dental work causing bleeding (up to 3 days before)
ASA, ibuprofen, naproxen (7 d prior)
Vitamin C can cause false NEGATIVE FOBT.
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