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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.
Tests to detect nitrites and leukocyte esterase have become part of a routine urinalysis. Most species of bacteria that colonize in the urine cause nitrates, which are derived from dietary metabolites, to be converted to nitrites.In healthy people, both the urinary nitrite test and the leukocyte esterase (LE) tests are negative.A negative nitrite test does not necessarily mean that the urine is free of all bacteria, particularly if there are clinical symptoms, because some bacteria do not produce nitrites.n healthy people, both the urinary nitrite test and the leukocyte esterase (LE) tests are negative. A negative nitrite test does not necessarily mean that the urine is free of all bacteria, particularly if there are clinical symptoms, because some bacteria do not produce nitrites.