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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.
How accurate is the test? The test is fairly sensitive to the presence of drugs in the urine. This means that if drugs are present, you will usually get a preliminary positive result. If you get a preliminary positive result, you should send the urine sample to the laboratory for a second, more accurate test. It is very important to send the urine sample to the lab, because the drug of abuse urine screening may give positive results when no drugs are actually present.