Does a pets diet affect the results of the fecal occult blood test?
Yes, the pet’s diet can affect the test resulting in false positive and much less frequently false negative results. False Positive: Red meat (cooked or raw) or canned foods containing red meat such as beef, lamb and venison will often result in a false positive occult blood test. Canned foods containing chicken or fish appear to have no effect on the test. Dry food diets do not appear to affect the test. False Negative: A diet high in Vitamin C may result in a false negative result in the fecal occult blood test. This would be an extremely unusual occurrence in dogs or cats consuming any of the standard diets.
