Urinary Nitrite Test
A nitrite test is a standard component of a urinary test strip. A positive test for nitrites in the urine is called nitrituria.
This test is commonly used in diagnosing urinary tract infections. A positive nitrite test indicates that the cause of the UTI is a gram negative organism, most commonly Escherichia coli. The reason for nitrites existence in the presence of a UTI is due to a bacterial conversion of endogenous nitrates to nitrites.
This may be a sign of infection, however, the other parameters such as leukocyte esterase, urine white blood cell count, and symptoms such as dysuria, urinary urgency, fevers and chills must be correlated to diagnose an infection.
False negative nitrite tests in urinary tract infections occur in cases with a low colony forming unit count, or in recently voided or dilute urine. In addition, a nitrite test does not detect organisms unable to reduce nitrate to nitrite, such as enterococci, staphylococci, or adenovirus.
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