Urine nitrite (NIT)

Some bacteria in the urinary system can reduce the protein metabolite nitrate in the urine to nitrite. Therefore, the determination of the presence of nitrite in the urine can quickly and indirectly know the urinary bacterial infection, as a urinary tract infection. Screening test. Clinically, the incidence of urinary tract infections is high and sometimes asymptomatic, especially in female patients. Diagnosis of urinary tract infection requires urinary bacterial culture, which takes a long time and certain conditions, and the urinary nitrite qualitative test can quickly obtain the results, which is helpful for the diagnosis of the disease. When the obvious urinary tract infection uses bacteria to reduce the characteristics of nitrate to nitrite, the phenol coupling produces a red positive reaction. The positive rate of urinary nitrite depends on the retention time of urine in the bladder for more than 4 hours, and the positive rate can reach 80%. If the urinary tract infection does not reduce the nitrate to nitrite, or if the urine stays in the bladder for a short period of time, or if the urine lacks nitrite, a negative result will result. A positive result indicates that there are more than 100,000 bacteria in the urine. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: normal. Positive: It is found in urinary tract infections caused by Gram-negative bacilli such as Escherichia coli, Paramyxos, Proteus, Aerobacter, and Pseudomonas aeruginosa. Tips: It is better to leave your urine at 7 o'clock in the morning. Do not drink plenty of water before the urine test. Wash the vulva before leaving the urine. The container used should be clean and free from contamination. Do not mix chemicals such as detergents, disinfectants and preservatives to avoid affecting the inspection results. Women should not do this check during the menstrual period. Normal value negative. Recorded as (-). Clinical significance The urinary nitrite positive result is common in pyelonephritis caused by Escherichia coli (Escherichia coli), and its positive rate accounts for more than two-thirds of the total; it is caused by bacteria such as Enterobacteriaceae such as Escherichia coli. Symptoms or asymptomatic urinary tract infections, cystitis, bacteriuria, etc. Negative urine nitrite test does not mean that there is no bacterial infection, but urinary tract infection caused by some bacteria that do not have the ability to reduce nitrate can not show positive. Such bacteria have non-fermenting bacteria such as Acinetobacter or urine. Failure to stay in the bladder for more than 4 hours. Note that if the urinary tract infection does not reduce the nitrate to nitrite, or if the urine remains in the bladder for a short period of time, or if the urine is deficient in nitrate, a negative result will result. Positive results may be diseases: precautions for urinary tract infections Note before inspection: 1, take the urine in the bladder for more than 4 hours, usually at 7 o'clock in the morning to stay in the urine is better. Do not drink plenty of water before the urine test. 2, the urine volume for inspection: generally 5 ~ 10ml, if you want to measure the specific gravity of the urine can not be less than 50ml; should be sent immediately after the urine, to avoid the test results are wrong after the urine is placed. 3. Wash the vulva before leaving the urine. The container used should be clean and free of pollution. Do not mix chemicals such as detergents, disinfectants and preservatives to avoid affecting the inspection results. 4, women should not do this check during the menstrual period. Inspection process Inspection method: urine test. Not suitable for the crowd Menstrual women. Adverse reactions and risks no.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.