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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 (UTIs). A positive nitrite test indicates that the cause of the UTI is a Gram-negative organism, most commonly Escherichia coli. The reason for nitrites ...
False positive results can occur if the sample is contaminated with vaginal secretions; false negatives can occur in very concentrated samples or those containing high levels of glucose and protein. [54] Elevated white blood cell counts in urine generally indicate infection or inflammation. [55]
Urinalysis is the most useful test to start the work up in a patient of dysuria. Urinalysis positive for nitrite carries a high predictive value of a positive urine culture. Also, urine dipstick showing leukocytes as equal predictive value as the presence of nitrites. When both are present, the predictive value goes even higher.
Neutrophil granulocytes are the leukocytes most commonly associated with urinary infections. A positive test for leukocyte esterase normally indicates the presence of bacteria and a positive nitrite test (although it is not always the case). Infections caused by Trichomonas, Chlamydia and yeasts produce leukocyturia without
Reference ranges for urine tests are described below: Measurement Lower limit Upper limit ... Nitrite: n/a: 0 / negative [2] Leukocytes: n/a: 0 / negative [2] See also.
Urinary tract infections, even asymptomatic presence of bacteria in the urine, are more concerning in pregnancy due to the increased risk of kidney infections. [42] During pregnancy, high progesterone levels elevate the risk of decreased muscle tone of the ureters and bladder, which leads to a greater likelihood of reflux, where urine flows ...
Sometimes a supplement, medication, or food can cause your urine to turn green, but it's usually not something you need to be worried about. Sometimes a supplement, medication, or food can cause ...
Clinical urine tests today duly note the color, turbidity, and odor of urine but also include urinalysis, which chemically analyzes the urine and quantifies its constituents. A culture of the urine is performed when a urinary tract infection is suspected, as bacteriuria without symptoms does not require treatment. [ 32 ]