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13 lis 2023 · The most helpful dipstick values diagnostically are pH, nitrites, leukocyte esterase, and blood. Remember that in patients with symptoms of a UTI, a negative dipstick result does not rule out the UTI, but positive findings can suggest the diagnosis.
Only 3% of nitrite negative UTIs were caused by enterococcus. Given the low prevalence of enterococcal UTI, the absence of dipstick nitrite should not affect routine empiric antibiotic choice for presumptive UTI in young children.
Several factors can lead to a false negative nitrite result, including a short time between urine collection and testing, the amount of bacteriuria, a urine pH less than 6.0, organisms that further reduce nitrites to ammonia and dilute urine, and the presence of blood, urobilinogen, medications, or ascorbic acid . A nitrite test is not a ...
Infection with non-nitrate-reducing organisms such as entero-cocci and staphylococci will result in a negative nitrate test. Insufficient dietary nitrate intake and short retention of urine in the bladder (less than four hours) can also cause false-neg-ative results.8 LE reflects the presence of white blood cells (WBCs) in the urine.
15 lis 2013 · A test that is positive for nitrites in the urine indicates the presence of an organism that reduces nitrate. 1 However, not all urinary pathogens are nitrate reducers.
We believe that the cause of nitrite-negative results is a lack of dietary nitrate, dilution of urine and exogenous interference (e.g. ascorbic acid). These findings support the idea that standard urine culture is necessary to rule out UTI.
15 kwi 2004 · Urinary tract infections (UTIs) are among the most common bacterial infections and account for a significant part of the workload in clinical microbiology laboratories. Enteric bacteria (in particular, Escherichia coli) remain the most frequent cause of UTIs, although the distribution of pathogens that cause UTIs is changing.
