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An Indication Of Urinary Tract Infection. Veterinarians usually screen dog and cat urine sample using a paper strip impregnated at different points with chemicals that change color when particular compounds are present in your petâs urine. One of those compounds the test looks for is nitrite. Nitrite is produced by certain bacteria. When the test is done correctly and your petâs urine contains any nitrite, it is quite likely that it has a bacterial urinary tract infection (UTI) - even when no bacteria were seen. Urine that sits too long at room temperature can give a false-positive due to bacterial contamination and growth while it sat.
Presence of nitrites and leukocyte-esterase is often taken as diagnostic of infection, but confirmation with microscopy and culture is recommended. Phenazopyridine will often cause false-positive results of urine dipstick testing. If a patient has taken phenazopyridine, culture is warranted for diagnosis. Decision to treat based on history and exam findings may be acceptable but should be reassessed after culture returns. â Claire Babcock O'Connell, MPH, PA-C (151-3)